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 | 
                                                539,658,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,526,845,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,419,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,777,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,353,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,422,391,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,331,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                540,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,320,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,334,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,470,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||
| Depreciation | 
                                                1,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,791,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,801,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,566,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,707,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,369,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                574,095,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                541,726,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                574,095,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,240,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                53,414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |