Key Financial Data Of Group
| Concept | As at 2024-09-30 | 2024-04-01 to 2024-09-30 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-09-30 | 2023-04-01 to 2023-09-30 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Revenue | — | 
                                                935,621,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,603,672,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                767,138,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) before tax | — | 
                                                89,042,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,969,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                56,318,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss), attributable to owners of parent | — | 
                                                73,511,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                17,045,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                35,810,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income, attributable to owners of parent | — | 
                                                1,393,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                205,583,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                192,674,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Equity attributable to owners of parent | 
                                                1,529,842,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,595,988,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,643,730,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                3,462,237,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,569,603,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,547,406,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                41.06
                                                
                                             | 
                                                9.51
                                                
                                             | — | — | 
                                                19.97
                                                
                                             | 
| Diluted earnings (loss) per share | — | 
                                                40.91
                                                
                                             | 
                                                9.47
                                                
                                             | — | — | 
                                                19.90
                                                
                                             | 
| Ratio of owners' equity to gross assets | 
                                                0.442
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.447
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.463
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Cash flows from (used in) operating activities | — | 
                                                77,411,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                172,475,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                53,222,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash flows from (used in) investing activities | — | 
                                                -55,732,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -845,802,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -787,454,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash flows from (used in) financing activities | — | 
                                                -66,259,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                614,060,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                670,156,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                292,993,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                335,687,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                333,993,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |