Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,693,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                895,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable from completed construction contracts | 
                                                731,841,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                312,971,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Costs on construction contracts in progress | 
                                                127,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                63,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                820,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                890,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                504,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                522,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                2,030,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,817,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -7,641,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                82,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                10,388,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,998,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Land | 
                                                4,147,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,035,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | 
                                                7,554,948,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,104,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                323,359,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                14,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Own-used assets | ||
| Intangible assets | ||
| Intangible assets | 
                                                590,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                174,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Goodwill | 
                                                540,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                126,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                49,255,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other intangible assets | ||
| Investments and other assets | ||
| Investment securities | 
                                                623,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                725,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                1,190,849,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,233,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                104,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable from subsidiaries and associates | 
                                                101,594,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                134,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                222,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                163,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -213,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -137,055,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                9,335,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,512,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | ||
| Assets | 
                                                19,724,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,511,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Non-current liabilities | 
                                                1,849,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,034,246,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                1,026,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,383,447,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                355,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                420,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                258,545,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                42,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                7,103,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,485,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                3,272,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,357,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                65,646,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                806,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                829,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                8,953,175,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,520,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                10,524,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,625,291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                1,290,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,290,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,271,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,269,783,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                8,280,977,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,392,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -318,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -328,087,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                234,527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                340,462,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                218,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                300,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred gains or losses on hedges | 
                                                -4,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -72,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                10,771,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,991,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                19,724,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,511,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable for construction contracts | 
                                                316,688,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                176,078,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                15,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,115,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of long-term borrowings | 
                                                722,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                739,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                98,717,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Non-current liabilities | ||
| Provision for retirement benefits for directors (and other officers) | 
                                                76,916,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,690,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings | ||
| Valuation and translation adjustments |