Consolidated Statement Of Income
| Concept | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of income | ||||||||||||||||||||||||
| Statement of income | ||||||||||||||||||||||||
| Net sales | — | 
                                                26,058,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,196,899,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,130,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -988,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,731,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                23,638,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,070,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                20,942,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,779,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,730,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,077,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                23,587,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -959,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                22,627,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cost of sales | — | — | — | — | — | — | — | — | — | 
                                                17,236,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,199,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                15,365,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                16,467,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Operating expenses | ||||||||||||||||||||||||
| Operating expenses - general | ||||||||||||||||||||||||
| Remuneration for directors (and other officers) | — | — | — | — | — | — | — | — | — | 
                                                203,879,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                147,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Welfare expenses | — | — | — | — | — | — | — | — | — | 
                                                505,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                547,573,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                465,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                503,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Taxes and dues | — | — | — | — | — | — | — | — | — | 
                                                106,932,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                106,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Depreciation | — | — | — | — | — | — | — | — | — | 
                                                179,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                180,732,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                145,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                151,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Operating expenses | ||||||||||||||||||||||||
| Selling, general and administrative expenses | — | — | — | — | — | — | — | — | — | 
                                                4,965,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,249,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,598,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                4,882,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision of allowance for doubtful accounts | — | — | — | — | — | — | — | — | — | 
                                                391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                -1,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | — | — | — | — | — | — | — | 
                                                808,467,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,150,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                789,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,114,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Operating expenses | ||||||||||||||||||||||||
| Other operating expenses | ||||||||||||||||||||||||
| Operating expenses | ||||||||||||||||||||||||
| Gross profit (loss) | — | — | — | — | — | — | — | — | — | 
                                                6,401,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,870,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,577,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                6,159,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                1,720,894,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                490,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                509,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                721,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,570,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,720,894,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,117,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                65,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                741,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                589,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,396,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,396,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Operating expenses | ||||||||||||||||||||||||
| Research and development expenses | — | — | — | — | — | — | — | — | — | — | 
                                                141,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                122,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| General and administrative expenses | ||||||||||||||||||||||||
| Salaries | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Operating profit (loss) | — | — | — | — | — | — | — | — | — | 
                                                1,435,338,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,621,774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                979,079,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,277,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net sales | ||||||||||||||||||||||||
| Net sales of completed construction contracts | — | — | — | — | — | — | — | — | — | 
                                                13,520,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,617,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,773,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                13,031,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cost of sales | ||||||||||||||||||||||||
| Cost of sales of completed construction contracts | — | — | — | — | — | — | — | — | — | 
                                                9,894,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,618,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,501,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                9,291,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Selling, general and administrative expenses | ||||||||||||||||||||||||
| Sales commission | — | — | — | — | — | — | — | — | — | 
                                                11,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                10,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Advertising expenses | — | — | — | — | — | — | — | — | — | 
                                                16,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                17,152,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Non-operating income | ||||||||||||||||||||||||
| Interest income | — | 
                                                2,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                31,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Dividend income | — | — | — | — | — | — | — | — | — | 
                                                58,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                67,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                67,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Interest on securities | — | — | — | — | — | — | — | — | — | 
                                                2,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
| Other | — | — | — | — | — | — | — | — | — | 
                                                59,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,619,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                21,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                8,567,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-operating income | — | — | — | — | — | — | — | — | — | 
                                                158,011,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                122,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                151,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                132,514,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Extraordinary income | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                132,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                132,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Extraordinary losses | — | — | — | — | — | — | — | — | — | 
                                                10,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Impairment losses | — | 
                                                10,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,365,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-operating expenses | ||||||||||||||||||||||||
| Interest expenses | — | 
                                                5,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,919,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-operating expenses | — | — | — | — | — | — | — | — | — | 
                                                22,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                13,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                14,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) before income taxes | — | — | — | — | — | — | — | — | — | 
                                                1,559,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,710,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,250,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,526,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Gross profit | ||||||||||||||||||||||||
| Gross profit (loss) on completed construction contracts | — | — | — | — | — | — | — | — | — | 
                                                3,626,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,999,005,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,271,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                3,739,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Extraordinary income | ||||||||||||||||||||||||
| Gain on sale of non-current assets | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Gain on sale of investment securities | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                88,051,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                88,051,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes - current | — | — | — | — | — | — | — | — | — | 
                                                503,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                559,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                352,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                456,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes - deferred | — | — | — | — | — | — | — | — | — | 
                                                -26,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -26,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                21,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                20,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Extraordinary losses | ||||||||||||||||||||||||
| Loss on retirement of non-current assets | — | — | — | — | — | — | — | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes | — | — | — | — | — | — | — | — | — | 
                                                477,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                533,152,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                374,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                476,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | — | — | 
                                                1,082,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,082,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,082,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,177,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,082,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                875,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                875,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                875,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                875,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,049,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to non-controlling interests | — | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -2,193,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | 
                                                1,177,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                1,177,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,177,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,052,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                1,052,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,052,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit attributable to | ||||||||||||||||||||||||
| Other comprehensive income | ||||||||||||||||||||||||
| Valuation difference on available-for-sale securities | — | — | — | — | — | — | — | — | — | — | 
                                                133,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -124,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | — | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -36,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans, net of tax | — | — | — | — | — | — | — | — | — | — | 
                                                117,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -45,287,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other comprehensive income | — | — | — | — | — | — | — | — | — | — | 
                                                250,893,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -206,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income | — | — | — | — | — | — | — | — | — | — | 
                                                1,427,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                843,366,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income attributable to | ||||||||||||||||||||||||
| Comprehensive income attributable to owners of parent | — | — | — | — | — | — | — | — | — | — | 
                                                1,427,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                855,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income attributable to non-controlling interests | — | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -12,338,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |