Semi-Annual Balance Sheet
| Concept | As at 2025-03-31 | As at 2024-09-30 | 
|---|---|---|
| Semi-annual balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                2,335,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                966,179,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Inventories | 
                                                742,007,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                337,119,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                634,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                159,254,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                5,481,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,255,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                8,451,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,121,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Tools, furniture and fixtures | 
                                                856,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                802,530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                2,483,406,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,653,269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                87,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,479,813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Accumulated depreciation | 
                                                -3,535,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -2,844,229,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                182,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                183,886,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Investments and other assets | 
                                                799,841,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                696,903,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Allowance for doubtful accounts | 
                                                -57,632,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -57,595,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | 
                                                9,434,389,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,002,516,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Deferred assets | ||
| Deferred assets | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                980,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                14,916,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,259,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                870,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                302,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                99,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                582,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                654,093,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                3,198,560,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,295,313,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Non-current liabilities | 
                                                5,777,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,490,320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Bonds payable | 
                                                29,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                58,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Long-term borrowings | 
                                                5,082,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                911,671,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                99,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                98,810,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                491,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                370,606,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                8,976,190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,785,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Provision for bonuses | 
                                                141,067,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other liabilities | — | — | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                1,004,947,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,000,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | ||
| Capital surplus | 
                                                916,058,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                911,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | ||
| Retained earnings | 
                                                3,925,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,477,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Treasury shares | 
                                                -530,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                5,846,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,389,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Valuation difference on available-for-sale securities | 
                                                9,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                9,848,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                5,940,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,473,537,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                14,916,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,259,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |