Key Financial Data Of Group
| Concept | 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 | 2024-04-01 to 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 | — | — | — | 
                                                3,290,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,395,534,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,040,238,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,639,951,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,324,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,867,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,156,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,742,835,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,929,979,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,439,074,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | — | — | 
                                                -40,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                33,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -354,103,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -345,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                247,162,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                227,650,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                120,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                129,544,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                225,086,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                218,938,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | — | — | 
                                                -118,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -668,526,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                145,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                91,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                138,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | — | — | 
                                                -117,414,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -667,743,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                145,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                92,654,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                141,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | — | 
                                                674,472,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                940,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                816,143,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                988,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,692,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,527,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,424,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,564,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,402,410,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,522,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | — | 
                                                2,440,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,418,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,558,060,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,518,803,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,624,549,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,559,945,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,231,942,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,279,325,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,241,946,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,281,195,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | — | 
                                                122.97
                                                
                                             | — | 
                                                173.21
                                                
                                             | — | — | — | 
                                                148.82
                                                
                                             | 
                                                182.09
                                                
                                             | — | 
                                                311.89
                                                
                                             | 
                                                279.99
                                                
                                             | — | — | — | 
                                                261.17
                                                
                                             | 
                                                288.31
                                                
                                             | 
                                                251.47
                                                
                                             | — | — | 
                                                280.54
                                                
                                             | 
| Basic earnings (loss) per share | — | — | — | 
                                                -21.85
                                                
                                             | — | 
                                                -4.88
                                                
                                             | 
                                                -121.79
                                                
                                             | 
                                                -123.17
                                                
                                             | — | — | 
                                                31.58
                                                
                                             | — | — | 
                                                26.82
                                                
                                             | 
                                                15.78
                                                
                                             | 
                                                16.84
                                                
                                             | — | — | — | 
                                                27.93
                                                
                                             | 
                                                25.44
                                                
                                             | — | 
| Diluted earnings per share | — | — | — |  | — |  |  |  | — | — |  | — | — |  |  |  | — | — | — |  |  | — | 
| Equity-to-asset ratio | — | — | 
                                                0.273
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.389
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.316
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.392
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.645
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.594
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.635
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.687
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.609
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.667
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | — | — | — | 
                                                -0.161
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                -0.027
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                -0.493
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                -0.574
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.105
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.099
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.055
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.066
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.103
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.105
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | — | — | 
                                                -14.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                -63.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                -2.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                -2.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                13.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                15.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                27.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                25.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                26.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                28.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | — | 
                                                276,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -316,739,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                617,250,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                493,725,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                340,184,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | — | — | 
                                                -234,144,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -353,437,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -557,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -472,474,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -381,116,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | — | — | 
                                                -147,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                772,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                88,450,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -177,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -64,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | — | 
                                                606,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                711,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                609,336,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                461,052,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                617,349,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Number of employees | 
                                                107
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                28
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                135
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                107
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                118
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                94
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                111
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                134
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                140
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                111
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                136
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                105
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |