Consolidated Statement Of Income
| Concept | 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 | 2022-04-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 2022-04-01 to 2022-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of income | ||||||||||||
| Statement of income | ||||||||||||
| Operating expenses | ||||||||||||
| Selling, general and administrative expenses | — | — | — | 
                                                1,012,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,010,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Operating expenses | ||||||||||||
| Operating profit (loss) | 
                                                267,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                154,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -495,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                229,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                724,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                303,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                372,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                267,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                866,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -493,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                249,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                349,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | — | 
                                                236,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                387,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Net sales | ||||||||||||
| Net sales of completed construction contracts | 
                                                3,833,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,943,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,641,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,641,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,864,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,573,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,573,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,021,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,235,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cost of sales | ||||||||||||
| Cost of sales of completed construction contracts | — | — | — | 
                                                8,400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,190,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Selling, general and administrative expenses | ||||||||||||
| Employees' salaries and allowances | — | — | — | 
                                                275,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                285,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Non-operating income | ||||||||||||
| Dividend income | — | — | — | 
                                                3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Other | — | — | — | 
                                                2,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Non-operating income | — | — | — | 
                                                28,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                29,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Non-operating expenses | ||||||||||||
| Interest expenses | — | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                0
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Other | — | — | — | 
                                                5,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Non-operating expenses | — | — | — | 
                                                21,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                14,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Profit (loss) before income taxes | — | — | — | 
                                                236,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                387,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Gross profit | ||||||||||||
| Gross profit (loss) on completed construction contracts | — | — | — | 
                                                1,241,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,383,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Income taxes | — | — | — | 
                                                87,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                137,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
| Profit (loss) | — | — | — | 
                                                149,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — |