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 | — | 
                                                79,332,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                148,255,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                73,314,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) before tax | — | 
                                                18,198,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,616,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                21,146,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss), attributable to owners of parent | — | 
                                                16,373,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,851,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                16,176,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Comprehensive income, attributable to owners of parent | — | 
                                                18,866,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                32,614,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                19,679,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Equity attributable to owners of parent | 
                                                234,936,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                220,224,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                211,466,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                268,542,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                263,404,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                249,499,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Basic earnings (loss) per share | — | 
                                                243.09
                                                
                                             | 
                                                383.82
                                                
                                             | — | — | 
                                                240.17
                                                
                                             | 
| Diluted earnings (loss) per share | — | 
                                                243.07
                                                
                                             |  | — | — |  | 
| Ratio of owners' equity to gross assets | 
                                                0.875
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.836
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.848
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Cash flows from (used in) operating activities | — | 
                                                17,732,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,289,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,938,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash flows from (used in) investing activities | — | 
                                                -13,340,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,921,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -1,693,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash flows from (used in) financing activities | — | 
                                                -4,996,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -9,719,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -4,685,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | 
                                                56,387,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                58,094,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                62,855,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — |