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 | 
                                                1,425,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,594,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,051,925,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,594,937,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,117,104,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,352,458,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,452,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,115,948,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,452,186,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                983,779,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                28,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                150,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                122,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -150,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,291,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                124,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                114,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -124,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                3,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,582,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,308,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,046,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                808,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                487,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                7,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,327,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                790,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                11,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,318,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |