Key Financial Data Of Reporting Company
| Concept | As at 2023-09-30 | 2023-04-01 to 2023-09-30 | 2023-04-01 to 2023-09-30 | As at 2023-09-30 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | As at 2022-09-30 | 2022-04-01 to 2022-09-30 | As at 2022-09-30 | 2022-04-01 to 2022-09-30 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2021-09-30 | 2021-04-01 to 2021-09-30 | As at 2021-09-30 | 2021-04-01 to 2021-09-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||||||||||||||||
| Business results of reporting company | ||||||||||||||||||||
| Operating revenue | — | — | 
                                                1,360,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,984,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,607,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,559,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,184,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Ordinary income | — | 
                                                22,525,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                51,411,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                27,030,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                51,094,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                24,978,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | 
                                                1,521,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                707,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,761,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,543,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                996,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,061,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,203,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,572,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                610,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,501,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | — | — | 
                                                697,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,169,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                996,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,843,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Share capital | 
                                                18,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                18,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                18,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                18,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Total number of issued shares | 
                                                18,142,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | 
                                                18,142,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
                                                18,142,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                18,142,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                181,421,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
| Net assets | 
                                                52,459,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                81,987,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                52,385,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                90,621,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                57,343,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                102,219,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                109,233,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,130,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                57,264,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                118,137,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | 
                                                63,670,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                3,051,039,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                63,557,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,019,852,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                68,455,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,032,692,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,265,199,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                68,232,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                68,491,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,282,472,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets per share | — | — | — | 
                                                4,524.13
                                                
                                             | — | — | 
                                                5,011.71
                                                
                                             | — | — | — | 
                                                5,363.17
                                                
                                             | — | — | — | 
                                                5,732.01
                                                
                                             | — | — | — | 
                                                6,219.77
                                                
                                             | — | 
| Dividend paid per share | — | — | 
                                                37.50
                                                
                                             | — | 
                                                75.00
                                                
                                             | — | — | — | — | 
                                                37.50
                                                
                                             | — | — | 
                                                41.25
                                                
                                             | — | — | — | — | 
                                                3.75
                                                
                                             | — | — | 
| Basic earnings (loss) per share | — | 
                                                48.19
                                                
                                             | — | — | — | — | — | 
                                                179.19
                                                
                                             | — | — | — | 
                                                128.89
                                                
                                             | — | 
                                                190.15
                                                
                                             | — | — | — | — | — | 
                                                123.57
                                                
                                             | 
| Diluted earnings per share | — |  | — | — | — | — | — |  | — | — | — | 
                                                107.79
                                                
                                             | — | 
                                                148.59
                                                
                                             | — | — | — | — | — | 
                                                88.55
                                                
                                             | 
| Equity-to-asset ratio | 
                                                0.823
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.026
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.824
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.029
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.837
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.033
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.033
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.837
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.836
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.035
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                135,621,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -404,539,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -404,324,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                85,902,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                106,694,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) investing activities | — | 
                                                -95,804,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                913,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                45,501,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                34,700,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -61,454,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net cash provided by (used in) financing activities | — | 
                                                -747,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -7,235,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -860,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -7,021,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -6,274,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Cash and cash equivalents | — | — | — | 
                                                351,116,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                312,037,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                363,222,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                722,891,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                648,267,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Number of employees | 
                                                171
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                1,447
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                181
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,476
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                175
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1,524
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1,566
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                109
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                109
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1,625
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Average number of temporary employees | 
                                                33
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                674
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                707
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                729
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                769
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                11
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                11
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                790
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |