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 | 
                                                1,714,898,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,820,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                214,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                140,837,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,496,456,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,576,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Prepaid expenses | 
                                                18,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | ||
| Property, plant and equipment | 
                                                1,783,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,859,270,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                1,182,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,234,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Construction in progress | 
                                                16,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,715,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,710,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -2,491,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,483,821,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other, net | 
                                                224,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                226,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                67,163,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investment securities | 
                                                35,276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,854,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                222,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                254,121,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax assets | 
                                                3,114,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                184,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                217,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                2,073,627,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,186,435,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                5,570,083,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,762,579,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Income taxes payable | 
                                                5,781,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,728,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                105,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                137,785,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                1,012,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,070,350,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accounts payable - other | 
                                                255,698,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,022,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                519,140,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                534,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                52,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,973,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Lease liabilities | 
                                                5,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,680,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,574,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                1,531,932,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,604,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for retirement benefits for directors (and other officers) | 
                                                62,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred tax liabilities | 
                                                144,965,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                132,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Share capital | 
                                                468,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                468,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | ||
| Capital surplus | ||
| Capital surplus | 
                                                388,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                388,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                3,001,876,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,085,221,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                3,857,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,941,297,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                8,055,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                180,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                216,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                4,038,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,158,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                5,570,083,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,762,579,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |