Notes - Segment Information, Etc.
| Concept | 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 | 2023-10-01 to 2024-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 2022-10-01 to 2023-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                298,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,849,078,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,849,078,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                105,292,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,445,043,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,011,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                143,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,011,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                257,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,609,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -36,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -45,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,590,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,445,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,286,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,812,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                190,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,516,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |