Key Financial Data Of Group
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 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 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | As at 2021-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||||||||||||||||||||
| Business results of group | ||||||||||||||||||||||||||
| Net sales | — | — | — | 
                                                32,429,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                43,154,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                28,005,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                35,873,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,574,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,334,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                38,709,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                49,419,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                24,014,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                41,053,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | — | — | 
                                                4,933,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,008,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,776,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,283,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,571,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,179,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                465,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                321,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,347,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -997,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | — | — | — | — | — | 
                                                4,373,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1,183,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,765,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                662,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                704,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | — | — | — | — | — | 
                                                5,551,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                3,026,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,420,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -1,131,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -1,199,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | — | — | — | — | — | — | 
                                                32,501,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                26,118,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                20,938,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                27,294,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                24,474,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                18,302,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                21,318,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                16,144,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                22,450,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                16,178,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | — | — | — | — | — | — | 
                                                59,557,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                47,805,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                43,159,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                55,488,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                61,496,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,607,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                66,021,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                54,896,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                75,912,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                61,743,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | — | — | — | — | — | — | 
                                                4,723.52
                                                
                                             | — | 
                                                3,795.96
                                                
                                             | — | 
                                                3,042.88
                                                
                                             | 
                                                3,966.58
                                                
                                             | — | — | — | 
                                                3,556.63
                                                
                                             | 
                                                2,659.69
                                                
                                             | 
                                                3,097.96
                                                
                                             | — | — | 
                                                2,346.05
                                                
                                             | — | 
                                                3,262.20
                                                
                                             | — | 
                                                2,350.81
                                                
                                             | 
| Basic earnings (loss) per share | — | — | — | 
                                                627.18
                                                
                                             | — | — | 
                                                635.61
                                                
                                             | — | — | — | 
                                                388.11
                                                
                                             | — | — | 
                                                171.97
                                                
                                             | 
                                                372.42
                                                
                                             | 
                                                401.92
                                                
                                             | — | — | — | 
                                                101.38
                                                
                                             | 
                                                96.22
                                                
                                             | — | 
                                                473.49
                                                
                                             | — | 
                                                102.41
                                                
                                             | — | 
| Diluted earnings per share | — | — | — |  | — | — |  | — | — | — |  | — | — |  |  |  | — | — | — |  |  | — |  | — |  | — | 
| Equity-to-asset ratio | — | — | — | — | — | — | — | 
                                                0.546
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.546
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.485
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.492
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.398
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.362
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.323
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.294
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.296
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.262
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | — | — | — | 
                                                0.183
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.146
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.136
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.046
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.149
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.121
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.043
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.030
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.211
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.031
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | — | — | 
                                                3.86
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                3.81
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                3.81
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                8.59
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3.20
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2.97
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                13.14
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13.84
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2.24
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                10.34
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | — | — | — | — | 
                                                8,932,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                5,919,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                12,947,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                24,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                14,373,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | — | — | — | — | — | 
                                                2,582,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -652,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -4,032,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -128,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                774,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | — | — | — | — | — | 
                                                -4,621,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -8,255,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -6,481,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -695,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -11,829,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | — | — | — | — | — | — | 
                                                11,246,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                4,157,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                6,847,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,344,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                5,214,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Number of employees | 
                                                55
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                924
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                55
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1,229
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,174
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                979
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                979
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,221
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1,160
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                903
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,249
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                911
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1,372
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                876
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |