Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,943,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,928,398,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - trade | 
                                                268,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                300,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                180,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                146,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Supplies | 
                                                3,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,455,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                237,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                321,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -3,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,626,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,688,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                3,446,035,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,514,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                2,051,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,073,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -3,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -3,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                427,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                464,710,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                1,343,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,382,470,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                245,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                245,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | 
                                                5,759,852,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,748,508,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -4,998,269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,953,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Buildings and structures, net | 
                                                761,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                795,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Own-used assets | ||
| Intangible assets | ||
| Intangible assets | 
                                                50,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Assets | 
                                                7,072,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,203,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Non-current liabilities | ||
| Long-term borrowings | 
                                                615,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                637,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                1,068,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,074,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provision for retirement benefits for directors (and other officers) | 
                                                24,808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,014,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                220,242,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                234,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                2,050,665,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,091,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                121,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                120,849,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Short-term borrowings | 
                                                1,824,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,124,575,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current portion of long-term borrowings | 
                                                43,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                46,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                22,265,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,396,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                712,549,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                895,415,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,852,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,372,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                4,903,662,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,463,284,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                1,866,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,415,383,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                320,668,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                10,355,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,244,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -8,647,492,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,716,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -162,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -161,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                294,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                311,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                195,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                209,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Revaluation reserve for land | 
                                                67,295,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,295,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                8,213,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                2,169,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,740,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                7,072,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,203,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Valuation and translation adjustments | ||
| Remeasurements of defined benefit plans | 
                                                31,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |