Key Financial Data Of Group
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of group | |||||||||||||||||||||||||||||
| Business results of group | |||||||||||||||||||||||||||||
| Net sales | — | — | — | — | — | 
                                                486,802,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                162,092,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                164,040,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                468,237,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                182,370,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                494,738,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                274,828,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                655,265,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                242,452,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                613,889,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | — | — | — | — | 
                                                22,372,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                22,435,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                20,472,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,333,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                23,720,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -8,745,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                28,059,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                41,549,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                13,537,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                23,293,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | — | — | — | — | 
                                                -4,816,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                28,981,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -7,034,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                24,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                22,936,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | — | — | — | — | 
                                                -6,346,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                58,633,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,810,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                31,637,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                35,598,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | — | — | — | 
                                                412,013,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                202,920,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                429,355,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                203,181,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                193,824,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                381,631,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                394,035,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                184,119,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                380,635,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                184,390,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | — | — | — | 
                                                865,669,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                637,068,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                789,034,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                463,599,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                450,561,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                732,681,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                837,954,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                485,417,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                769,710,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                496,859,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | — | — | — | 
                                                4,067.90
                                                
                                             | — | — | 
                                                2,089.11
                                                
                                             | — | — | — | — | — | — | — | 
                                                4,210.11
                                                
                                             | 
                                                2,092.43
                                                
                                             | — | 
                                                1,996.63
                                                
                                             | 
                                                3,726.39
                                                
                                             | — | — | — | 
                                                3,813.16
                                                
                                             | 
                                                1,896.64
                                                
                                             | 
                                                3,549.52
                                                
                                             | — | — | 
                                                1,817.64
                                                
                                             | 
| Basic earnings (loss) per share | — | — | — | — | — | 
                                                -49.60
                                                
                                             | — | — | — | — | 
                                                100.40
                                                
                                             | — | — | 
                                                170.08
                                                
                                             | 
                                                298.59
                                                
                                             | — | — | 
                                                197.04
                                                
                                             | — | — | 
                                                -72.54
                                                
                                             | 
                                                217.38
                                                
                                             | 
                                                249.31
                                                
                                             | — | — | — | 
                                                132.24
                                                
                                             | 
                                                226.79
                                                
                                             | — | 
| Diluted earnings per share | — | — | — | — | — |  | — | — | — | — | 
                                                100.36
                                                
                                             | — | — | 
                                                170.00
                                                
                                             | 
                                                298.45
                                                
                                             | — | — | 
                                                196.82
                                                
                                             | — | — |  | 
                                                216.72
                                                
                                             | 
                                                248.56
                                                
                                             | — | — | — | 
                                                131.86
                                                
                                             | 
                                                226.14
                                                
                                             | — | 
| Equity-to-asset ratio | — | — | — | — | 
                                                0.456
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.318
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                0.518
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.438
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.430
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.494
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.441
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.378
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.466
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.370
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | — | — | — | — | — | 
                                                -0.012
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.048
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.083
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.075
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.101
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                -0.019
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.116
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.067
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.074
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.066
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                21.66
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                16.03
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                9.13
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                10.43
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                9.19
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8.01
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                17.83
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                10.40
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | — | — | — | 
                                                35,837,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                52,960,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                18,127,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                32,711,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                66,054,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | — | — | — | — | 
                                                -63,152,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -33,316,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -26,019,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -43,373,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -39,433,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | — | — | — | — | 
                                                105,851,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -15,712,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                2,443,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,371,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                10,852,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | — | — | — | 
                                                115,442,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | 
                                                35,859,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                30,703,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                78,761,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                79,646,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Number of employees | 
                                                1,777
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                271
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                526
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,811
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                7,563
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1,687
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,693
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,811
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                85
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                734
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,554
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                7,882
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,243
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2,216
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8,028
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                9,849
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,058
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                10,897
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                3,318
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |