Consolidated 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 | 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 | 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 | 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 | 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 | 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 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | 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 | As at 2024-03-31 | 2023-04-01 to 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 | 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 | 
                                                -119,734,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,170,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                207,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,170,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                207,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,186,984,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,133,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,876,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                472,320,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -119,734,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                265,213,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,133,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,170,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,002,869,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                252,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,692,789,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,050,429,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,349,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                6,394,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                207,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,133,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                6,062,274,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,170,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -140,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,897,733,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                214,255,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                214,255,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                214,255,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,171,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                252,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,657,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                945,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,171,719,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -140,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,133,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,225,611,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,821,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                403,881,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                189,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,276,529,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                314,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                165,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,648,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                252,440,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                149,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,133,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,133,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                695,819,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                165,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,576,253,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,968,657,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                165,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,170,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,170,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -148,685,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -148,685,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,170,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,890,906,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,803,423,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,421,089,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Changes during period | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Dividends of surplus | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -70,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -70,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -70,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -70,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                -70,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -70,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -70,085,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -69,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -69,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                -69,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -69,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                -69,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -69,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -69,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Profit (loss) attributable to owners of parent | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                155,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                155,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                155,002,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                305,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                305,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                305,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Disposal of treasury shares | — | — | — | — | 
                                                -1,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                20,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                20,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                19,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                19,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                19,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                19,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -1,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                9,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | 
                                                9,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                9,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,480,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                8,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Net changes in items other than shareholders' equity | — | — | — | 
                                                -7,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                68,438,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -7,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                75,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                68,438,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -7,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                49,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                40,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                49,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                89,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                49,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                49,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                89,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
| Total changes during period | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -7,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                68,438,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -7,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                20,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                105,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                124,710,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                75,588,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                117,560,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                55,174,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                123,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                35,600,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                105,135,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -7,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                249,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                245,476,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                258,850,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                307,872,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                40,206,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                89,227,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                49,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                249,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,021,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                236,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                334,704,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                8,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |