Notes - Segment Information, Etc.
| Concept | 2024-10-01 to 2025-03-31 | 2024-10-01 to 2025-03-31 | 2024-10-01 to 2025-03-31 | 2024-10-01 to 2025-03-31 | 2024-10-01 to 2025-03-31 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 2023-10-01 to 2024-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|
| Notes - Segment information, etc. | ||||||||||
| Segment information | ||||||||||
| Disclosure of sales, profit (loss), asset, liability, and other items for each reportable segment | ||||||||||
| Sales | ||||||||||
| Revenues from external customers | 
                                                590,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                590,687,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                111,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                479,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                481,803,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,563,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,563,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,081,278,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | — | — | — | — | — | 
                                                6,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,671,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,665,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | — | — | — | — | — | 
                                                2,420,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,449,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,826,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |