Quarterly Consolidated Balance Sheet
| Concept | As at 2025-03-31 | As at 2024-09-30 | 
|---|---|---|
| Quarterly consolidated balance sheet | ||
| Balance sheet | ||
| Assets | ||
| Current assets | ||
| Cash and deposits | 
                                                1,160,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,015,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Merchandise and finished goods | 
                                                735,722,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                768,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Work in process | 
                                                225,171,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                246,463,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Raw materials and supplies | 
                                                707,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                685,142,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                133,075,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                146,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current assets | 
                                                3,358,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,267,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current assets | ||
| Property, plant and equipment | 
                                                552,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                532,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Property, plant and equipment | ||
| Buildings and structures | — | — | 
| Buildings and structures, net | 
                                                413,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                405,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Land | 
                                                43,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | — | — | 
| Other, net | 
                                                96,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                83,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Intangible assets | ||
| Intangible assets | 
                                                70,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                70,950,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | 
                                                524,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                533,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments and other assets | ||
| Non-current assets | 
                                                1,148,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,136,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Assets | 
                                                4,506,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,404,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | ||
| Current liabilities | ||
| Short-term borrowings | 
                                                640,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Income taxes payable | 
                                                58,434,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                57,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Current liabilities | 
                                                2,341,147,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,369,932,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | ||
| Long-term borrowings | 
                                                595,778,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                728,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retirement benefit liability | 
                                                4,541,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Asset retirement obligations | 
                                                279,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                275,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other | 
                                                2,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,776,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Non-current liabilities | 
                                                882,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,013,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities | 
                                                3,223,320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,383,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | ||
| Shareholders' equity | ||
| Share capital | 
                                                136,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Capital surplus | 
                                                259,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,300,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Retained earnings | 
                                                872,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                824,210,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Shareholders' equity | 
                                                1,268,512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,006,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | ||
| Foreign currency translation adjustment | 
                                                14,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Valuation and translation adjustments | 
                                                14,361,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets | 
                                                1,282,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,020,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Liabilities and net assets | 
                                                4,506,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,404,187,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |