Key Financial Data Of Reporting Company
| Concept | As at 2025-02-28 | As at 2025-02-28 | 2024-03-01 to 2025-02-28 | 2024-03-01 to 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | 2023-03-01 to 2024-02-29 | As at 2024-02-29 | 2023-03-01 to 2024-02-29 | As at 2024-02-29 | As at 2023-02-28 | 2022-03-01 to 2023-02-28 | As at 2023-02-28 | 2022-03-01 to 2023-02-28 | As at 2022-02-28 | 2021-03-01 to 2022-02-28 | 2021-03-01 to 2022-02-28 | As at 2022-02-28 | 2020-03-01 to 2021-02-28 | As at 2021-02-28 | As at 2021-02-28 | 2020-03-01 to 2021-02-28 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | |||||||||||||||||||||||||||||||
| Business results of reporting company | |||||||||||||||||||||||||||||||
| Operating revenue | — | — | 
                                                171,550,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                313,171,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                283,347,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                150,314,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                244,295,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                122,924,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                228,367,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                120,831,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                191,948,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                104,793,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | 
                                                49,408,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                64,455,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                63,024,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                43,687,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                47,815,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                34,260,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                42,790,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                33,212,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                24,195,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                24,772,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | — | — | 
                                                39,051,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                34,959,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                28,122,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                24,903,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                18,066,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | — | — | — | — | — | 
                                                10,355,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                10,355,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,355,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                10,355,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                10,355,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total number of issued shares | — | — | — | — | — | 
                                                186,490,633
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                186,490,633
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
                                                186,490,633
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | 
                                                186,490,633
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
                                                186,490,633
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
| Net assets | — | — | — | — | — | 
                                                350,852,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                494,815,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                484,755,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                339,711,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                423,691,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                299,095,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                409,181,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                293,125,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                389,011,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                278,320,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | — | — | — | — | 
                                                520,673,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                653,068,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                615,826,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                507,531,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                534,097,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                452,034,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                502,532,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                428,631,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                473,804,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                398,293,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets per share | — | — | — | — | — | 
                                                2,069.23
                                                
                                             | — | — | — | — | — | — | — | 
                                                2,821.41
                                                
                                             | — | — | 
                                                2,637.30
                                                
                                             | — | 
                                                1,942.14
                                                
                                             | 
                                                2,344.59
                                                
                                             | — | 
                                                1,710.11
                                                
                                             | — | 
                                                2,241.23
                                                
                                             | — | — | 
                                                1,655.37
                                                
                                             | — | 
                                                2,115.44
                                                
                                             | 
                                                1,563.77
                                                
                                             | — | 
| Dividend paid per share | — | — | 
                                                85.00
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                85.00
                                                
                                             | — | — | — | — | 
                                                60.00
                                                
                                             | — | — | 
                                                45.00
                                                
                                             | — | — | — | — | 
                                                35.00
                                                
                                             | 
| Interim dividend paid per share | — | — | 
                                                35.00
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                20.00
                                                
                                             | — | — | — | — | 
                                                20.00
                                                
                                             | — | — | 
                                                17.50
                                                
                                             | — | — | — | — | 
                                                17.50
                                                
                                             | 
| Basic earnings (loss) per share | — | — | 
                                                227.92
                                                
                                             | 
                                                254.75
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                259.51
                                                
                                             | — | 
                                                199.87
                                                
                                             | — | — | 
                                                190.37
                                                
                                             | — | 
                                                159.79
                                                
                                             | — | 
                                                167.24
                                                
                                             | 
                                                140.56
                                                
                                             | — | 
                                                82.54
                                                
                                             | — | — | 
                                                101.34
                                                
                                             | 
| Diluted earnings per share | — | — |  |  | — | — | — | — | — | — | — | — | — | — | — |  | — |  | — | — |  | — |  | — |  |  | — |  | — | — |  | 
| Equity-to-asset ratio | — | — | — | — | — | 
                                                0.674
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                0.733
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.745
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.669
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.766
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.662
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.787
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.684
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.793
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.699
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Rate of return on equity | — | — | 
                                                0.113
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.093
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                0.104
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.109
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.083
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.095
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.077
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.087
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.039
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.065
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Price-earnings ratio | — | — | 
                                                31.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                27.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                18.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                24.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                24.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                29.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                28.6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                34.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                48.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                39.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Payout ratio | — | — | 
                                                0.373
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                0.425
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.375
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.320
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.345
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | — | — | — | 
                                                51,617,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                43,350,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                45,404,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                53,460,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,512,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | — | 
                                                -18,465,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                -62,706,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -9,175,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -36,030,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -27,226,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | — | 
                                                -39,298,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                -11,630,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -19,125,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -12,482,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -17,220,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                76,608,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                82,424,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                112,121,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                92,341,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                85,827,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Number of employees | 
                                                130
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                146
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                447
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                40
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                81
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,587
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,873
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,970
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                189
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                146
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,873
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                31
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                3,617
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                401
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,297
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                357
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                3,239
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                352
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                3,305
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                357
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Average number of temporary employees | 
                                                14
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                96
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,157
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,334
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,067
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,334
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                3,476
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,866
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2,644
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2,648
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                31
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Total shareholder return | — | — | — | — | — | 
                                                2.224
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                1.530
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                1.468
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                1.463
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                1.214
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Total return on share price index | — | — | — | — | — | 
                                                2.002
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                1.951
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                1.418
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                1.307
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                1.264
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |