Key Financial Data Of Group
| Concept | 2024-03-01 to 2025-02-28 | 2024-03-01 to 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | 2023-03-01 to 2024-02-29 | As at 2024-02-29 | 2023-03-01 to 2024-02-29 | As at 2024-02-29 | As at 2023-02-28 | 2022-03-01 to 2023-02-28 | As at 2023-02-28 | 2022-03-01 to 2023-02-28 | As at 2022-02-28 | 2021-03-01 to 2022-02-28 | 2021-03-01 to 2022-02-28 | As at 2022-02-28 | 2020-03-01 to 2021-02-28 | As at 2021-02-28 | As at 2021-02-28 | 2020-03-01 to 2021-02-28 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||||||||||||||
| Business results of group | ||||||||||||||||||||
| Net sales | 
                                                7,260,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,263,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,840,572,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,838,791,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,041,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,046,717,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,199,610,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,151,578,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,294,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,276,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                335,089,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                359,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                339,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                320,646,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                14,967,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,964,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -99,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -118,586,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -502,217,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -510,024,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | 
                                                363,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                437,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -61,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -448,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -977,774,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Comprehensive income | — | 
                                                363,309,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                437,004,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -61,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -448,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -977,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net assets | — | — | 
                                                1,986,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,976,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,650,150,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,684,522,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,335,416,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,388,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,407,520,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,397,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,856,460,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,855,623,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | — | 
                                                4,961,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,021,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,576,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,535,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,300,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,273,451,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,620,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,449,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,718,493,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,572,346,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets per share | — | — | 
                                                344.66
                                                
                                             | 
                                                342.93
                                                
                                             | — | 
                                                284.91
                                                
                                             | — | 
                                                290.87
                                                
                                             | 
                                                220.90
                                                
                                             | — | 
                                                229.75
                                                
                                             | — | 
                                                232.82
                                                
                                             | — | — | 
                                                231.09
                                                
                                             | — | 
                                                307.06
                                                
                                             | 
                                                307.61
                                                
                                             | — | 
| Basic earnings (loss) per share | 
                                                58.79
                                                
                                             | 
                                                63.03
                                                
                                             | — | — | 
                                                72.99
                                                
                                             | — | 
                                                69.86
                                                
                                             | — | — | 
                                                -10.21
                                                
                                             | — | 
                                                0.37
                                                
                                             | — | 
                                                -74.68
                                                
                                             | 
                                                -76.52
                                                
                                             | — | 
                                                -162.76
                                                
                                             | — | — | 
                                                -163.13
                                                
                                             | 
| Diluted earnings per share |  |  | — | — |  | — |  | — | — |  | — |  | — |  |  | — |  | — | — |  | 
| Equity-to-asset ratio | — | — | 
                                                0.400
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.394
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.295
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.303
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.250
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.262
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.249
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.255
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.323
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.332
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Rate of return on equity | 
                                                0.185
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.201
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.294
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.274
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.002
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Price-earnings ratio | 
                                                7.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                7.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                6.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                6.6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1,060.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | — | 
                                                382,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                504,029,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                186,108,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                127,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -682,475,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -55,676,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,324,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                45,053,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -31,709,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -39,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -868,888,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -223,106,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -369,170,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                296,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,053,401,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | — | — | 
                                                906,201,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,448,748,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,165,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,303,508,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                911,608,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Number of employees | — | — | 
                                                258
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                258
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                249
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                248
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                249
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                248
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                262
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                261
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                263
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                262
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Average number of temporary employees | — | — | 
                                                600
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                604
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                578
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                576
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                512
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                510
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                452
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                452
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                456
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                453
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |