Quarterly Consolidated Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,463,428,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,899,577,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                7,037,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,402,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                790,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,030,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                11,749,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,964,393,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                12,094,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,105,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                4,587,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,687,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                6,909,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,862,838,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Leased assets | — | — | 
| Leased assets, net | 
                                                55,734,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,035,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                1,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                539,371,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                528,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Other | 
                                                152,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                118,096,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                161,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                4,423,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,493,128,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                113,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                105,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term loans receivable | 
                                                18,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                1,392,864,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,394,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                90,717,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                89,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -19,857,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -20,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                16,679,101,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,725,878,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                28,428,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,690,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                3,876,099,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,826,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                431,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                169,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,964,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,895,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                9,068,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,812,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                2,121,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,648,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                646,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                623,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                1,010,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,002,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                4,957,966,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,401,213,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                14,026,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,213,299,000
                                                
                                                    
                                                        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 | 
                                                11,762,817,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,876,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -667,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -666,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                14,234,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,348,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                24,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,114,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Remeasurements of defined benefit plans | 
                                                -22,514,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -24,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                1,807,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -5,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-controlling interests | 
                                                165,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                134,008,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                14,401,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,476,971,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                28,428,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,690,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |