Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,583,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,599,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts receivable - trade | 
                                                193,702,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                212,544,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                6,917,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                36,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,827,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                86,640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                85,519,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                1,907,330,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,942,347,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                2,708,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,512,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                783,339,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                802,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Guarantee deposits | 
                                                207,722,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                211,631,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                259,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                274,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                1,750,236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,545,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Own-used assets | ||
| Other | 
                                                978,909,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                902,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation and impairment | 
                                                -4,643,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -4,716,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                175,374,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                164,635,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Assets | 
                                                4,616,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,454,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                102,050,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                478,348,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                422,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Provisions | ||
| Provision for bonuses | 
                                                54,994,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                47,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                139,185,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                183,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                988,999,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                957,047,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Provision for retirement benefits for directors (and other officers) | 
                                                197,926,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                193,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                22,530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                557,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                547,154,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                187,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                183,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                1,546,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,504,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | ||
| Shareholders' equity | 
                                                3,069,335,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,950,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,026,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,026,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                1,999,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,880,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -6,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                3,069,335,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,950,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                4,616,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,454,564,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity |