Notes - Segment Information, Etc.
| Concept | 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 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 2022-01-01 to 2022-12-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                5,059,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,117,363,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,941,571,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,059,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,000,829,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                953,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,758,414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,106,565,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,818,253,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,818,253,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                136,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                81,870,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                142,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,912,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,481,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                68,943,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                144,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                137,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                27,966,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,589,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,310,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                180,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,026,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                269,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                239,147,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                238,877,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |