Quarterly Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Quarterly balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                13,269,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,598,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                13,422,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,041,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                851,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                42,733,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,881,236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                58,024,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,384,843,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Tools, furniture and fixtures | — | — | 
| Tools, furniture and fixtures, net | 
                                                136,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                122,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                10,805,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,805,148,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                350,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,113,525,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                385,797,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                449,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Software | 
                                                350,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                413,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                35,113,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                12,497,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,688,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                11,155,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,256,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                590,399,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                652,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                592,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                590,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -10,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -10,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                70,907,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                71,521,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                113,641,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,403,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                664,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,691,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                8,292,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,066,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                952,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                79,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                821,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                318,320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                13,374,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,865,698,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Bonds payable | 
                                                6,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                22,570,968,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,134,790,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                4,281,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,281,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                39,600,205,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,168,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                52,974,228,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,034,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                6,826,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,826,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                6,982,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,982,890,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                41,847,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,660,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -1,546,919,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,630,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                54,109,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,839,332,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                2,202,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,063,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                3,919,496,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,960,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share acquisition rights | 
                                                22,923,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                60,667,047,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,368,892,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                113,641,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                100,403,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |