Notes - Segment Information, Etc.
| Concept | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                1,844,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,341,621,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,935,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,121,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,121,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,800,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,270,387,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,607,403,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,678,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,678,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                380,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -151,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                8,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,992,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,124,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,640,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,110,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                44,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,510,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                5,958,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                95,659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                474,242,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                575,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                575,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                96,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                129,081,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,059,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                134,141,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |