Statement Of Changes In Equity
| Concept | 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 | As at 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 | 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 | 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 | 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 | 2023-04-01 to 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 | As at 2024-03-31 | As at 2024-03-31 | As at 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 | 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 2024-03-31 | As at 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 | 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 | 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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Statement of changes in equity | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Net assets | 
                                                17,668,123,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                230,531,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                15,526,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                109,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,916,634,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,083,042,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,953,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -1,509,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                19,631,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,697,194,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                883,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,963,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,466,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                17,647,110,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,466,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,693,830,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -111,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,110,850,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                959,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                2,060,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,661,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                227,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,097,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,953,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                109,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                19,707,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,500,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,953,930,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,839,991,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                216,793,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,631,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,577,577,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,683,457,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,097,107,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,466,663,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -141,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,945,993,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                536,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,696,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,449,914,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                109,922,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Changes during period | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Dividends of surplus | — | — | — | — | — | — | — | — | — | — | — | 
                                                -975,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -975,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -975,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                -975,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -1,143,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,143,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -1,143,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                -1,143,421,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Profit (loss) | — | — | — | — | — | — | — | — | — | — | — | 
                                                2,390,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,390,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,390,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                2,390,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                1,804,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,804,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,804,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                1,804,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disposal of treasury shares | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                41,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                3,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                38,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                40,406,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                40,406,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                10,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                30,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Net changes in items other than shareholders' equity | — | 
                                                -14,065,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -97,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -7,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                -75,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -97,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                422,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                6,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                429,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                429,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Total changes during period | — | 
                                                -14,065,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,415,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,415,706,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -97,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,013,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,773,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -75,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,398,057,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -76,302,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                422,842,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                660,935,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,358,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                701,116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,130,317,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                10,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                29,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                429,200,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                660,935,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |