Notes - Segment Information, Etc.
| Concept | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 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 | 2023-04-01 to 2024-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 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 | 
                                                5,389,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                992,268,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,389,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,280,746,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                116,037,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,219,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,172,767,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,219,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                959,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                87,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                740,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,861,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                160,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                743,518,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                567,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,494,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                830,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                641,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                831,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                175,692,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,803,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                535,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                536,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                530,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                532,077,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                528,377,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                541,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |