Key Financial Data Of Group
| Concept | As at 2024-06-30 | 2023-07-01 to 2024-06-30 | 2023-07-01 to 2024-06-30 | As at 2024-06-30 | 2022-07-01 to 2023-06-30 | As at 2023-06-30 | As at 2023-06-30 | 2022-07-01 to 2023-06-30 | 2021-07-01 to 2022-06-30 | 2021-07-01 to 2022-06-30 | As at 2022-06-30 | As at 2022-06-30 | As at 2021-06-30 | 2020-07-01 to 2021-06-30 | 2020-07-01 to 2021-06-30 | As at 2021-06-30 | As at 2020-06-30 | 2019-07-01 to 2020-06-30 | 2019-07-01 to 2020-06-30 | As at 2020-06-30 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||||||||||||||
| Business results of group | ||||||||||||||||||||
| Net sales | — | 
                                                5,594,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,513,533,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,139,709,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,343,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,375,247,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,748,193,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                4,391,040,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,009,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,261,356,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,904,337,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                326,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                291,149,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                60,196,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                50,864,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                122,125,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                113,784,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                257,344,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                240,068,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                200,015,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                195,061,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | 
                                                218,412,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -41,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                222,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                231,249,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                152,667,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Comprehensive income | — | 
                                                221,841,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -28,321,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                228,927,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                240,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                152,591,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net assets | 
                                                2,432,504,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,339,234,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,186,920,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,234,272,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,286,203,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,204,939,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,070,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,984,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,800,049,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,853,271,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | 
                                                5,602,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,917,339,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,753,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,243,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                5,734,207,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,966,292,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,743,032,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,632,296,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,458,121,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,526,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | 
                                                493.39
                                                
                                             | — | — | 
                                                489.45
                                                
                                             | — | 
                                                457.19
                                                
                                             | 
                                                451.81
                                                
                                             | — | — | — | 
                                                465.86
                                                
                                             | 
                                                461.01
                                                
                                             | 
                                                424.55
                                                
                                             | — | — | 
                                                418.18
                                                
                                             | 
                                                378.79
                                                
                                             | — | — | 
                                                379.06
                                                
                                             | 
| Basic earnings (loss) per share | — | 
                                                46.26
                                                
                                             | 
                                                36.98
                                                
                                             | — | 
                                                1.34
                                                
                                             | — | — | 
                                                -8.81
                                                
                                             | 
                                                49.72
                                                
                                             | 
                                                47.34
                                                
                                             | — | — | — | 
                                                49.44
                                                
                                             | 
                                                43.67
                                                
                                             | — | — | 
                                                32.64
                                                
                                             | 
                                                33.01
                                                
                                             | — | 
| Diluted earnings per share | — | 
                                                45.59
                                                
                                             | 
                                                36.45
                                                
                                             | — | 
                                                1.33
                                                
                                             | — | — |  | 
                                                48.99
                                                
                                             | 
                                                46.64
                                                
                                             | — | — | — | 
                                                48.71
                                                
                                             | 
                                                43.02
                                                
                                             | — | — | 
                                                32.16
                                                
                                             | 
                                                32.52
                                                
                                             | — | 
| Equity-to-asset ratio | 
                                                0.416
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.470
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.454
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.407
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.384
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.438
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.419
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.422
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.397
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.392
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | — | 
                                                0.098
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.078
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.003
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                -0.019
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.113
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.107
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.123
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.110
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.090
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.091
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | 
                                                11.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                332.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                9.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                12.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                14.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                479,607,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                570,553,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                54,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                730,018,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                380,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -139,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -272,839,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -307,378,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -160,908,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -235,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -314,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -188,468,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                320,593,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -452,316,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -108,352,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | 
                                                675,550,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                651,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                542,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                476,629,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                360,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Number of employees | 
                                                305
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                270
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                279
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                310
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                323
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                289
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                306
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                287
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                271
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                291
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                76
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                61
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                62
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                78
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                66
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                51
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                72
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                56
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                62
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                76
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |