Consolidated Statement Of Income
| Concept | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2024-04-01 to 2024-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of income | ||||||||||||
| Statement of income | ||||||||||||
| Net sales | 
                                                4,882,698,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,945,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,135,917,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,676,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,308,121,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -459,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,258,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,855,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -402,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,300,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,698,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,258,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cost of sales | — | — | — | 
                                                8,844,121,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                8,092,163,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Operating expenses | ||||||||||||
| Selling, general and administrative expenses | — | — | — | 
                                                2,757,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,480,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Provision of allowance for doubtful accounts | — | — | — | 
                                                -736,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -39,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Operating expenses | ||||||||||||
| Other operating expenses | ||||||||||||
| Operating expenses | ||||||||||||
| Operating profit (loss) | — | — | — | 
                                                74,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                282,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| General and administrative expenses | ||||||||||||
| Operating expenses | ||||||||||||
| Gross profit (loss) | — | — | — | 
                                                2,831,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,763,518,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Ordinary profit (loss) | 
                                                -228,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                245,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                121,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                329,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                216,415,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                72,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                329,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net sales | ||||||||||||
| Net sales of completed construction contracts | — | — | — | 
                                                6,116,542,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                5,831,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Cost of sales | ||||||||||||
| Cost of sales of completed construction contracts | — | — | — | 
                                                4,951,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                4,385,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Selling, general and administrative expenses | ||||||||||||
| Non-operating income | ||||||||||||
| Dividend income | — | — | — | 
                                                36,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                31,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Interest income | — | — | — | 
                                                1,698,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Other | — | — | — | 
                                                11,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                8,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Non-operating income | — | — | — | 
                                                75,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                62,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Extraordinary income | — | — | — | 
                                                12,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Non-operating expenses | ||||||||||||
| Interest expenses | — | — | — | 
                                                5,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,817,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Other | — | — | — | 
                                                2,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Non-operating expenses | — | — | — | 
                                                11,355,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                16,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Extraordinary losses | — | — | — | 
                                                730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                10,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Impairment losses | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                10,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Profit (loss) before income taxes | — | — | — | 
                                                150,649,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                318,548,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Gross profit | ||||||||||||
| Gross profit (loss) on completed construction contracts | — | — | — | 
                                                1,164,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,445,974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Extraordinary income | ||||||||||||
| Gain on sale of non-current assets | — | — | — | 
                                                430,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Gain on sale of investment securities | — | — | — | 
                                                12,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Income taxes - current | — | — | — | 
                                                47,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                98,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Extraordinary losses | ||||||||||||
| Loss on sale of non-current assets | — | — | — | 
                                                239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Loss on retirement of non-current assets | — | — | — | 
                                                490,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Income taxes - deferred | — | — | — | 
                                                7,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                4,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Income taxes | — | — | — | 
                                                55,509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                103,658,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Profit (loss) | — | — | — | 
                                                95,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                214,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Profit (loss) attributable to owners of parent | — | — | — | 
                                                95,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                214,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Other comprehensive income | ||||||||||||
| Valuation difference on available-for-sale securities | — | — | — | 
                                                -5,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                134,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Remeasurements of defined benefit plans, net of tax | — | — | — | 
                                                -10,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -2,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Other comprehensive income | — | — | — | 
                                                -15,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                132,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Profit attributable to | ||||||||||||
| Comprehensive income | — | — | — | 
                                                79,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                346,958,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
| Comprehensive income attributable to | ||||||||||||
| Comprehensive income attributable to owners of parent | — | — | — | 
                                                79,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                346,958,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — |