Key Financial Data Of Group
| Concept | As at 2025-02-28 | As at 2025-02-28 | 2024-03-01 to 2025-02-28 | 2024-03-01 to 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 2025-02-28 | As at 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 | — | — | 
                                                9,600,303,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,608,307,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                9,730,666,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,956,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,185,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,526,599,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,836,975,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,156,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,453,979,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,867,675,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | — | — | 
                                                700,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                953,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                825,866,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                600,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                712,637,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                625,539,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                595,656,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                535,963,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                330,910,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                388,974,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | — | — | — | 
                                                503,862,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                358,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                295,618,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                242,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                146,436,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Comprehensive income | — | — | — | 
                                                644,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                456,235,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                366,869,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                270,764,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                152,535,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net assets | — | — | — | — | — | 
                                                2,698,056,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,271,806,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                2,744,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,436,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,390,134,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,277,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,129,616,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,161,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,932,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,010,482,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | — | — | — | — | 
                                                5,559,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,223,900,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                5,419,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,052,282,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,914,780,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,747,628,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,781,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,606,911,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,992,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,813,679,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets per share | — | — | — | — | — | 
                                                2,922.71
                                                
                                             | — | 
                                                3,544.25
                                                
                                             | — | — | — | — | — | 
                                                2,972.94
                                                
                                             | — | 
                                                2,638.92
                                                
                                             | 
                                                2,588.76
                                                
                                             | — | 
                                                2,466.92
                                                
                                             | — | 
                                                2,306.41
                                                
                                             | — | — | 
                                                2,340.50
                                                
                                             | — | 
                                                2,101.97
                                                
                                             | 
                                                2,187.00
                                                
                                             | — | 
| Basic earnings (loss) per share | — | — | 
                                                406.58
                                                
                                             | 
                                                545.82
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                388.78
                                                
                                             | — | 
                                                281.50
                                                
                                             | — | — | 
                                                320.16
                                                
                                             | — | 
                                                230.86
                                                
                                             | — | 
                                                264.03
                                                
                                             | 
                                                240.99
                                                
                                             | — | 
                                                159.29
                                                
                                             | — | — | 
                                                240.14
                                                
                                             | 
| Diluted earnings per share | — | — |  |  | — | — | — | — | — | — | — | — |  | — |  | — | — |  | — |  | — |  |  | — |  | — | — |  | 
| Equity-to-asset ratio | — | — | — | — | — | 
                                                0.485
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.483
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                0.475
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.482
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.469
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.479
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.438
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.468
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.384
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.418
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Rate of return on equity | — | — | 
                                                0.146
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.181
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                0.147
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.107
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.134
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.096
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.121
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.106
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.078
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.114
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Price-earnings ratio | — | — | 
                                                7.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                7.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                10.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                8.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                11.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                7.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                11.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                7.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | — | — | — | 
                                                858,028,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                821,794,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                730,397,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                619,583,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                395,486,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | — | 
                                                -620,258,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -576,425,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -560,267,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -184,775,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -267,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | — | 
                                                124,811,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -119,614,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -411,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -496,902,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                420,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | — | — | — | — | — | — | 
                                                1,434,160,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,011,645,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                862,341,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,086,446,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,143,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Number of employees | 
                                                26
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                46
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                13
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                191
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                317
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                46
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                106
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                232
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                26
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                259
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                192
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                244
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                183
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                229
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                170
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                240
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                183
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Average number of temporary employees | 
                                                48
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                196
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                852
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                852
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                196
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                602
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                602
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                48
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                810
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                810
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                770
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                770
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                802
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                769
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                788
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                762
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |