Notes - Segment Information, Etc.
| Concept | 2024-01-01 to 2024-03-31 | 2024-01-01 to 2024-03-31 | 2024-01-01 to 2024-03-31 | 2024-01-01 to 2024-03-31 | 2024-01-01 to 2024-03-31 | 2024-01-01 to 2024-03-31 | 2024-01-01 to 2024-03-31 | 2024-01-01 to 2024-03-31 | 2024-01-01 to 2024-03-31 | 2023-01-01 to 2023-03-31 | 2023-01-01 to 2023-03-31 | 2023-01-01 to 2023-03-31 | 2023-01-01 to 2023-03-31 | 2023-01-01 to 2023-03-31 | 2023-01-01 to 2023-03-31 | 2023-01-01 to 2023-03-31 | 2023-01-01 to 2023-03-31 | 2023-01-01 to 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                74,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                240,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                124,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                453,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                453,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                453,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                93,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                61,933,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                246,166,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,644,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                423,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                419,017,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                423,961,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,944,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                -1,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,800,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |