Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-03-31 | 
|---|---|---|
| Balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                7,532,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,328,863,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                59,178,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -2,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,691,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                858,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                600,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                14,143,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,358,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                23,881,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,198,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                10,131,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,131,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                2,736,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,076,972,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Property, plant and equipment | ||
| Own-used assets | ||
| Intangible assets | ||
| Intangible assets | 
                                                282,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                268,570,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                7,369,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,696,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                9,608,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,007,289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -2,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,253,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,523,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,525,320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                33,772,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,474,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other assets | — | — | 
| Other assets | ||
| Assets | 
                                                47,915,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,832,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Non-current liabilities | ||
| Non-current liabilities | 
                                                15,307,333,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,457,682,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                11,792,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,924,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | 
                                                28,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,824,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,727,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                125,094,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                123,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Current liabilities | 
                                                8,253,477,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,135,910,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                5,056,850,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,692,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                28,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                159,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | 
                                                77,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                309,414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                1,226,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,167,137,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | ||
| Provisions | ||
| Liabilities | 
                                                23,560,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,593,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Other liabilities | — | — | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                22,924,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,158,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                3,412,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,412,524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                2,211,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,211,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                17,718,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,955,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -417,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -421,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                1,430,060,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,080,518,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation difference on available-for-sale securities | 
                                                1,366,041,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,017,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                24,354,931,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,239,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                47,915,742,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,832,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Valuation and translation adjustments | ||
| Shareholders' equity | ||
| Capital surplus | ||
| Retained earnings |