Quarterly Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Quarterly balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                153,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                277,011,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                90,873,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                114,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -822,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                498,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                712,212,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                549,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                412,044,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings | — | — | 
| Buildings, net | 
                                                297,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                243,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                127,722,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                127,722,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                123,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | 
                                                86,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Investments and other assets | 
                                                842,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                841,214,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Other | 
                                                9,635,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                1,478,295,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,293,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                1,977,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,005,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Notes and accounts payable - trade | 
                                                92,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                87,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Short-term borrowings | 
                                                81,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,343,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                15,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                23,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,851,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                88,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                145,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                957,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                928,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                255,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                203,612,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                159,981,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                172,315,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                20,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                674,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                625,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                1,632,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,553,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                3,132,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,132,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -2,678,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,571,009,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -159,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -159,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                344,183,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                451,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                344,183,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                451,918,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                1,977,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,005,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |