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 | 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 and profit (loss) for each reportable segment | ||||||||||||
| Sales | ||||||||||||
| Revenues from external customers | 
                                                692,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                135,851,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                692,758,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                556,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,935,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,935,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                150,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,774,924,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -44,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -160,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                160,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                126,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                34,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |