Consolidated Statement Of Changes In Equity
| Concept | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 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 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Consolidated statement of changes in equity | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Net assets | 
                                                503,906,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -2,352,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,429,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,433,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                503,906,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,424,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                429,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,195,798,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,970,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,205,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                429,279,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,046,689,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,205,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,966,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                69,367,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                509,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,195,798,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,452,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                509,796,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,889,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Changes during period | ||||||||||||||||||||||||||||||||||||||||||||||||||
| Net changes in items other than shareholders' equity | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Total changes during period | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                228,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -382,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -382,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                74,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                228,660,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                74,626,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -80,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -80,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -80,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -80,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — |