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 | 
                                                5,607,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,216,703,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,607,016,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,379,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,010,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,059,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,117,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,941,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,059,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,000,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -11,281,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,978,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                124,633,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                37,048,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                120,710,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,907,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                77,754,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                136,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                142,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Investments in entities accounted for using equity method | 
                                                1,282,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,282,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,282,102,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,142,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,142,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,142,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                70,752,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,731,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                67,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,615,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                40,431,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,966,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |