Semi-Annual Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Semi-annual consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                6,450,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,531,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                413,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                347,163,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                19,406,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,179,692,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                13,510,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,087,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                4,338,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,412,959,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Machinery, equipment and vehicles | — | — | 
| Machinery, equipment and vehicles, net | 
                                                2,521,781,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,792,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                4,395,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,262,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                1,948,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,280,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                306,783,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                339,241,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                204,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                206,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                382,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                414,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                3,795,115,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,797,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                1,910,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,973,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                1,146,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,069,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                163,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                151,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                103,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                111,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -110,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                17,688,030,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,299,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                37,094,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,479,228,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit asset | 
                                                470,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                492,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                3,400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                213,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                638,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                484,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                507,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                7,055,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,247,897,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Bonds payable | 
                                                1,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                3,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                542,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                559,117,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                214,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                161,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                6,895,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,459,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                13,950,808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,707,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses | 
                                                500,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                505,435,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities for land revaluation | 
                                                1,001,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,001,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for bonuses for directors (and other officers) | 
                                                19,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Share capital | 
                                                5,001,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,001,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | 
                                                4,276,006,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,276,006,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                13,361,092,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,269,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -3,621,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,621,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                19,017,746,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,925,836,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                1,058,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,103,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Revaluation reserve for land | 
                                                1,971,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,971,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                206,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -99,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                363,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                387,261,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                3,600,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,363,207,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                525,060,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                483,047,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                23,143,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,772,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                37,094,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,479,228,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |