Key Financial Data Of Reporting Company
| Concept | As at 2024-06-30 | 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 reporting company | |||||||||||||||||||||
| Business results of reporting company | |||||||||||||||||||||
| Net sales | — | — | 
                                                8,526,716,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                8,566,699,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,546,976,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                8,189,192,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                7,412,721,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Operating revenue | — | — | — | 
                                                984,835,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,265,508,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,269,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,266,181,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,295,427,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | — | 
                                                1,135,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                575,581,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                869,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,202,038,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                680,871,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,161,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                939,084,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                646,145,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                858,173,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                779,859,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) | — | — | — | 
                                                98,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                767,239,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                607,130,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                563,755,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                755,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Share capital | — | — | — | — | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                400,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Total number of issued shares | — | — | — | — | 
                                                6,859,483
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
                                                6,235,894
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | — | 
                                                5,668,995
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
                                                5,153,632
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
                                                4,685,120
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
| Net assets | — | 
                                                7,529,388,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,062,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,024,549,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,862,708,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                6,039,741,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,332,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,225,678,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,767,211,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,249,340,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,860,495,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | 
                                                9,284,394,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,798,165,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,551,231,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,021,979,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                8,934,314,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,258,372,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,404,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                7,835,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,465,705,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,278,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | 
                                                1,170.49
                                                
                                             | — | — | 
                                                942.43
                                                
                                             | — | 
                                                948.05
                                                
                                             | 
                                                1,079.95
                                                
                                             | — | — | — | 
                                                962.71
                                                
                                             | 
                                                849.95
                                                
                                             | 
                                                842.65
                                                
                                             | — | — | 
                                                768.72
                                                
                                             | 
                                                696.15
                                                
                                             | — | — | 
                                                796.26
                                                
                                             | 
| Dividend paid per share | — | — | — | 
                                                30.00
                                                
                                             | — | 
                                                27.00
                                                
                                             | — | — | — | 
                                                25.00
                                                
                                             | — | — | — | — | — | 
                                                20.00
                                                
                                             | — | — | — | 
                                                25.00
                                                
                                             | — | 
| Interim dividend paid per share | — | — | — |  | — |  | — | — | — |  | — | — | — | — | — |  | — | — | — |  | — | 
| Basic earnings (loss) per share | — | — | 
                                                104.82
                                                
                                             | 
                                                15.44
                                                
                                             | — | 
                                                121.29
                                                
                                             | — | — | 
                                                127.87
                                                
                                             | 
                                                97.21
                                                
                                             | 
                                                124.91
                                                
                                             | — | — | — | 
                                                60.35
                                                
                                             | 
                                                91.45
                                                
                                             | — | — | 
                                                85.37
                                                
                                             | 
                                                124.66
                                                
                                             | — | 
| Diluted earnings per share | — | — |  |  | — |  | — | — |  |  |  | — | — | — |  |  | — | — |  |  | — | 
| Equity-to-asset ratio | — | 
                                                0.811
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.892
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.798
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.761
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.676
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.735
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.556
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.608
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.569
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.523
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | — | — | 
                                                0.093
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.016
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.135
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.125
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.120
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.138
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.074
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.118
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.111
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.194
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | — | 
                                                8.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                59.6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                6.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                5.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                7.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                12.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                7.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Payout ratio | — | — | — | 
                                                1.944
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.223
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.234
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                0.181
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.137
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                717,727,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                619,523,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                648,248,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,472,954,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                21,559,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                36,730,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -161,757,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -143,558,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -333,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -2,407,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -661,448,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -785,280,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -750,025,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -844,795,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,145,753,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Cash and cash equivalents | — | 
                                                1,723,536,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,630,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,957,868,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,203,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1,890,503,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Number of employees | 
                                                413
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                413
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                395
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                398
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                404
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                372
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                126
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                126
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                145
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                159
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                181
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                169
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total shareholder return | — | — | — | — | 
                                                2.146
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1.564
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1.497
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.378
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1.210
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
| Total return on share price index | — | — | — | — | 
                                                2.011
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1.662
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1.298
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.394
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1.066
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — |