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 | 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 and profit (loss) for each reportable segment | ||||||||||||
| Sales | ||||||||||||
| Revenues from external customers | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,354,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,354,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                539,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                318,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                495,915,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,177,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,177,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                461,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                252,892,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                462,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                -6,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |