Semi-Annual Balance Sheet
| Concept | As at 2023-12-31 | As at 2023-09-30 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                753,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                814,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                11,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                985,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,051,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Prepaid expenses | 
                                                15,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,311,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                777,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                792,980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Land | 
                                                157,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                157,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                26,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                40,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                3,129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Software | 
                                                2,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,176,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investments and other assets | 
                                                43,502,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term prepaid expenses | 
                                                1,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                31,518,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,338,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                10,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                824,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                839,501,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                1,809,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,890,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Accounts payable - trade | 
                                                4,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                1,828,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                113,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                145,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                27,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                7,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                7,080,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                120,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for bonuses | 
                                                6,388,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                346,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                346,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                313,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                313,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                1,086,576,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,135,883,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -56,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -56,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                1,689,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,738,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                1,689,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,738,647,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                1,809,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,890,856,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |