Notes - Segment Information, Etc.
| Concept | 2023-10-01 to 2023-12-31 | 2023-10-01 to 2023-12-31 | 2023-10-01 to 2023-12-31 | 2023-10-01 to 2023-12-31 | 2023-10-01 to 2023-12-31 | 2023-10-01 to 2023-12-31 | 2023-10-01 to 2023-12-31 | 2022-10-01 to 2022-12-31 | 2022-10-01 to 2022-12-31 | 2022-10-01 to 2022-12-31 | 2022-10-01 to 2022-12-31 | 2022-10-01 to 2022-12-31 | 2022-10-01 to 2022-12-31 | 2022-10-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                180,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                815,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                60,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,884,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,824,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                827,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                187,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                715,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,731,640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,799,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                828,739,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,424,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,020,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -14,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,489,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,065,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,261,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -17,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,354,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |