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 | 
                                                3,072,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                630,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                492,362,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,949,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,072,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,505,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,640,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                729,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,640,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                404,640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                362,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,322,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,494,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                334,066,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                368,649,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                238,812,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                294,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,683,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                288,509,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                151,202,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                42,506,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                102,498,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                152,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                775,498,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                794,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,979,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                788,441,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |