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 | 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 | 
                                                4,313,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,313,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                734,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,579,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,814,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,814,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                724,331,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,089,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                14,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,453,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                698,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,034,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,720,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,208,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                353,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,091,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                23,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                68,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                524,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |