Quarterly Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,299,776,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,413,649,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                96,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                91,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                7,364,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,413,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                850,619,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                703,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -501,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                11,072,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,309,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                11,771,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,808,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                4,288,957,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,346,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                6,909,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,909,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Leased assets, net | 
                                                52,491,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                3,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                517,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                502,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                127,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                142,180,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                136,809,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                151,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                4,474,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,511,449,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                107,950,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                115,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                17,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,290,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                1,554,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,549,685,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                92,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                91,611,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -19,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,207,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                16,383,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,471,072,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                27,455,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,780,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                3,102,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,228,456,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                235,319,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                443,734,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,174,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,115,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                8,247,917,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,432,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                1,700,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,954,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                608,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                593,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                1,009,974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,004,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                4,468,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,679,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                12,716,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,112,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,314,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,314,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,824,791,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,824,791,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                12,134,587,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,044,690,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -667,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -667,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                14,606,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,516,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                20,685,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                -20,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -21,732,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                515,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                132,390,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                147,418,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                14,739,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,668,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                27,455,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,780,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |