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 | 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 | 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 | 
                                                3,304,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,861,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,228,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                328,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,532,738,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,139,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                80,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,219,251,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,091,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,047,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -52,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                813,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -8,802,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                25,932,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                259,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                220,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,191,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                246,385,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,934,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                229,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                239,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                217,769,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,375,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                27,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,820,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                333,627,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,591,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                347,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                78,834,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                254,792,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |