Notes - Segment Information, Etc.
| Concept | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2024-01-01 to 2024-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 2023-01-01 to 2023-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                8,846,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,361,545,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                484,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,846,312,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,717,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,717,982,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                132,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,585,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,740,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -43,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||
| Depreciation | 
                                                14,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                142,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                142,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                142,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                202,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                202,255,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                202,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |