Quarterly Consolidated Balance Sheet
| Concept | As at 2024-09-30 | As at 2024-03-31 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,612,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,603,750,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Securities | 
                                                200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                300,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                63,471,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                35,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                3,551,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,817,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                67,642,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                34,507,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,291,449,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,272,786,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                46,866,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,063,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Intangible assets | ||
| Intangible assets | 
                                                5,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                678,896,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                583,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                730,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                647,010,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                4,022,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,919,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                36,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                94,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                187,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                428,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                443,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Asset retirement obligations | 
                                                18,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                18,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                447,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                461,952,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,838,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,838,882,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                1,858,093,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,858,093,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                -122,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -243,821,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -2,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                3,572,528,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,451,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                -889,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Foreign currency translation adjustment | 
                                                3,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                2,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                3,574,997,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,457,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                4,022,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,919,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |