Key Financial Data Of Group
| Concept | As at 2024-08-31 | 2024-03-01 to 2024-08-31 | 2023-03-01 to 2024-02-29 | As at 2024-02-29 | 2023-03-01 to 2023-08-31 | As at 2023-08-31 | 
|---|---|---|---|---|---|---|
| Key financial data of group | ||||||
| Business results of group | ||||||
| Operating revenue | — | 
                                                163,681,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                283,347,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                139,642,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                39,781,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                63,024,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                32,881,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | 
                                                26,485,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                45,283,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                21,751,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | 
                                                32,103,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                65,488,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                34,947,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | 
                                                472,585,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                484,755,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                451,481,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | 
                                                625,153,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                615,826,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                569,616,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Basic earnings (loss) per share | — | 
                                                155.11
                                                
                                             | 
                                                259.51
                                                
                                             | — | 
                                                124.59
                                                
                                             | — | 
| Diluted earnings per share | — |  |  | — |  | — | 
| Equity-to-asset ratio | 
                                                0.730
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.745
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.766
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | — | 
                                                33,196,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                43,350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                29,077,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -23,603,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -62,706,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -27,876,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -12,586,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -11,630,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -7,398,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                79,604,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                82,424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                107,524,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             |