Key Financial Data Of Group
| Concept | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2022-04-01 to 2023-03-31 | 2021-04-01 to 2022-03-31 | As at 2022-03-31 | 2021-04-01 to 2022-03-31 | As at 2022-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||||||||||
| Business results of group | ||||||||||||||||
| Operating revenue | — | — | — | — | — | — | 
                                                7,400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                7,375,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,674,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Ordinary income | — | — | 
                                                128,835,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                112,685,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                117,350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | — | 
                                                27,908,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                5,486,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                6,084,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,262,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,810,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                26,798,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | — | 
                                                19,318,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                18,630,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                17,191,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | — | 
                                                64,614,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -4,221,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,505,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | 
                                                302,002,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                450,790,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                392,561,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                303,187,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                303,009,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                402,604,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | 
                                                304,434,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,535,038,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                7,190,557,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                304,589,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                304,097,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,375,332,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | 
                                                8,275.16
                                                
                                             | — | — | 
                                                12,239.20
                                                
                                             | — | — | — | 
                                                10,626.43
                                                
                                             | 
                                                8,288.14
                                                
                                             | — | — | — | 
                                                8,202.04
                                                
                                             | — | 
                                                10,799.17
                                                
                                             | 
| Basic earnings (loss) per share | — | — | 
                                                530.55
                                                
                                             | — | — | — | 
                                                145.02
                                                
                                             | — | — | — | 
                                                162.90
                                                
                                             | 
                                                505.78
                                                
                                             | 
                                                74.68
                                                
                                             | — | 
                                                460.45
                                                
                                             | — | 
| Diluted earnings per share | — | — |  | — | — | — |  | — | — | — | 
                                                162.79
                                                
                                             | 
                                                505.44
                                                
                                             | 
                                                74.54
                                                
                                             | — | 
                                                459.61
                                                
                                             | — | 
| Equity-to-asset ratio | — | 
                                                0.9920
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.0592
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.0540
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.9953
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.9958
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.0476
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | — | — | 
                                                0.0462
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.0174
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.0198
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0473
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.0184
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.0436
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | — | 
                                                9.02
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                33.02
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                17.33
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5.58
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14.49
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                4.71
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                156,768,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -1,369,207,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,124,175,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                70,657,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -8,184,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                82,701,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -6,543,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -5,921,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -7,116,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | — | — | — | 
                                                968,268,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                747,378,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                2,130,686,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Number of employees | 
                                                2,451
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                164
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                108
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,451
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,927
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                416
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,532
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                144
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                142
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2,705
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                614
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                28
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                614
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                554
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                32
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                677
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                734
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |