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 | 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 | 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 | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,464,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,970,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                102,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,464,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,464,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                391,388,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,064,998,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,646,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                475,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,646,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,646,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                106,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Transactions with other segments | 
                                                -54,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                54,257,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -138,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                138,765,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Other items | ||||||||||||||
| Depreciation | 
                                                249,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                240,591,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                659,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                239,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                240,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                240,342,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                129,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                276,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                906,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                240,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                155,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                240,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                241,219,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                239,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Increase in property, plant and equipment and intangible assets | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |