Consolidated Statement Of Income
| Concept | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 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 | 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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of income | |||||||||||||||||||||||||||||
| Statement of income | |||||||||||||||||||||||||||||
| Net sales | — | 
                                                3,609,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,297,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                173,473,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,084,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,635,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,867,635,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,370,543,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,051,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,473,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,561,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                356,027,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,650,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                103,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,869,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,197,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                933,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,379,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cost of sales | — | — | — | 
                                                7,948,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                6,246,879,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                6,312,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,001,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Operating expenses | |||||||||||||||||||||||||||||
| Operating expenses - general | |||||||||||||||||||||||||||||
| Remuneration for directors (and other officers) | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                90,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                87,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Welfare expenses | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                163,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                158,323,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Rent expenses on land and buildings | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                83,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                81,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Depreciation | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                71,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                69,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Operating expenses | |||||||||||||||||||||||||||||
| Selling, general and administrative expenses | — | — | — | 
                                                2,351,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                1,918,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,849,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,331,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Provision of allowance for doubtful accounts | — | — | — | 
                                                861,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                4,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Operating expenses | |||||||||||||||||||||||||||||
| Other operating expenses | |||||||||||||||||||||||||||||
| Provision for retirement benefits for directors (and other officers) | — | — | — | 
                                                18,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                9,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                9,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                17,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Operating expenses | |||||||||||||||||||||||||||||
| Net sales | |||||||||||||||||||||||||||||
| Net sales of completed construction contracts | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                648,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                848,051,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Operating profit (loss) | — | 
                                                207,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -14,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                86,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                137,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                459,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -113,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                490,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                117,320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,035,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                108,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -18,545,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                297,065,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,835,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,301,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Gross profit (loss) | — | — | — | 
                                                2,348,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                1,804,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,885,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,378,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| General and administrative expenses | |||||||||||||||||||||||||||||
| Salaries | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Operating expenses | |||||||||||||||||||||||||||||
| Ordinary profit (loss) | — | — | — | 
                                                40,403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                -47,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                93,305,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                115,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cost of sales | |||||||||||||||||||||||||||||
| Cost of sales of completed construction contracts | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                626,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                787,674,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Selling, general and administrative expenses | |||||||||||||||||||||||||||||
| Amortization of goodwill | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,228,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,304,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Non-operating income | |||||||||||||||||||||||||||||
| Interest income | — | — | — | 
                                                1,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                2,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                4,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Dividend income | — | — | — | 
                                                37,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                43,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                31,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                38,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other | — | — | — | 
                                                17,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                10,736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                7,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                15,566,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Non-operating income | — | — | — | 
                                                74,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                73,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                61,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                76,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Extraordinary income | — | — | — | 
                                                75,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                90,545,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                191,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                236,147,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Non-operating expenses | |||||||||||||||||||||||||||||
| Interest expenses | — | — | — | 
                                                5,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                3,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                2,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other | — | — | — | 
                                                4,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                3,768,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                2,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,731,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Non-operating expenses | — | — | — | 
                                                31,638,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                7,164,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                4,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Extraordinary losses | — | — | — | 
                                                220,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                202,277,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                111,381,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                50,037,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Impairment losses | — | 
                                                59,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                200,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                59,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                81,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                200,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                36,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                48,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Gross profit | |||||||||||||||||||||||||||||
| Profit (loss) before income taxes | — | — | — | 
                                                -104,509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                -158,835,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                173,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                301,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes - current | — | — | — | 
                                                62,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                31,983,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                32,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                72,824,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Extraordinary income | |||||||||||||||||||||||||||||
| Gain on sale of non-current assets | — | — | — | 
                                                460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Gain on sale of investment securities | — | — | — | 
                                                58,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                49,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                15,757,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                43,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Income taxes - deferred | — | — | — | 
                                                42,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                41,388,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                27,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Extraordinary losses | |||||||||||||||||||||||||||||
| Income taxes | — | — | — | 
                                                104,724,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                73,371,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                34,255,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                100,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Profit (loss) | — | — | 
                                                -232,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -209,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -232,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -232,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -232,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                138,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                138,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                138,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                200,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to non-controlling interests | — | — | — | 
                                                -965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -9,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Profit (loss) attributable to owners of parent | 
                                                -208,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -208,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -208,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                210,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                210,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                210,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other comprehensive income | |||||||||||||||||||||||||||||
| Valuation difference on available-for-sale securities | — | — | — | 
                                                151,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                210,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Foreign currency translation adjustment | — | — | — | 
                                                64,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                39,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Remeasurements of defined benefit plans, net of tax | — | — | — | 
                                                -18,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                107,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Other comprehensive income | — | — | — | 
                                                197,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                357,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Profit attributable to | |||||||||||||||||||||||||||||
| Comprehensive income | — | — | — | 
                                                -11,887,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                558,262,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Comprehensive income attributable to | |||||||||||||||||||||||||||||
| Comprehensive income attributable to owners of parent | — | — | — | 
                                                -23,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                558,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Comprehensive income attributable to non-controlling interests | — | — | — | 
                                                12,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — |