Key Financial Data Of Reporting Company
| Concept | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | As at 2021-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||||||||||||||||||||||||
| Business results of reporting company | ||||||||||||||||||||||||||||
| Net sales | — | — | — | 
                                                14,072,138,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                14,078,418,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                12,835,844,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,842,071,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,242,459,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                12,247,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                13,515,970,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,518,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                13,315,368,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | — | — | 
                                                1,474,497,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,485,161,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,237,364,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,244,139,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,105,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,130,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,340,182,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,314,592,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,236,517,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) | — | — | — | 
                                                970,584,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                835,763,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                764,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                924,360,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                824,338,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Equity in earnings (losses) of affiliates if equity method is applied | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Share capital | — | — | — | — | — | — | — | — | — | — | — | 
                                                575,681,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                571,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                571,538,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                552,293,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                524,136,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total number of issued shares | — | — | — | — | — | — | — | — | — | — | — | 
                                                9,394,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
                                                9,390,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | — | 
                                                9,390,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
                                                9,354,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
                                                9,299,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Net assets | — | — | — | — | — | — | — | — | — | 
                                                7,290,751,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,283,684,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,677,860,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,676,357,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                5,968,605,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,975,770,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,331,580,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,359,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,554,904,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | — | — | — | — | — | — | — | — | 
                                                10,201,198,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,172,488,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,328,840,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,338,082,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                8,069,620,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,074,442,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,141,762,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                8,107,625,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,613,996,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | — | — | — | — | — | — | — | — | 
                                                767.03
                                                
                                             | — | 
                                                766.27
                                                
                                             | — | 
                                                704.13
                                                
                                             | 
                                                703.97
                                                
                                             | — | — | — | 
                                                629.52
                                                
                                             | 
                                                630.29
                                                
                                             | 
                                                563.64
                                                
                                             | — | — | 
                                                566.62
                                                
                                             | — |  | — | 
                                                482.40
                                                
                                             | 
| Dividend paid per share | — | — | — | 
                                                43.00
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                38.00
                                                
                                             | — | — | — | 
                                                36.00
                                                
                                             | — | — | — | — | 
                                                35.00
                                                
                                             | — | — | 
                                                32.00
                                                
                                             | — | — | — | 
| Interim dividend paid per share | — | — | — | 
                                                19.00
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                18.00
                                                
                                             | — | — | — | 
                                                18.00
                                                
                                             | — | — | — | — | 
                                                16.00
                                                
                                             | — | — | 
                                                14.00
                                                
                                             | — | — | — | 
| Basic earnings (loss) per share | — | — | — | 
                                                104.17
                                                
                                             | — | — | — | — | 
                                                105.09
                                                
                                             | — | — | — | 
                                                89.80
                                                
                                             | — | — | 
                                                90.41
                                                
                                             | 
                                                82.41
                                                
                                             | 
                                                84.61
                                                
                                             | — | — | — | 
                                                100.10
                                                
                                             | 
                                                97.31
                                                
                                             | — | 
                                                89.98
                                                
                                             | — |  | — | 
| Diluted earnings per share | — | — | — | 
                                                102.80
                                                
                                             | — | — | — | — | 
                                                103.70
                                                
                                             | — | — | — | 
                                                88.73
                                                
                                             | — | — | 
                                                89.33
                                                
                                             | 
                                                81.40
                                                
                                             | 
                                                83.57
                                                
                                             | — | — | — | 
                                                98.46
                                                
                                             | 
                                                95.72
                                                
                                             | — | 
                                                88.10
                                                
                                             | — |  | — | 
| Equity-to-asset ratio | — | — | — | — | — | — | — | — | — | 
                                                0.701
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.702
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.703
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.702
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.724
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.725
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.640
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.647
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.583
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | — | — | — | 
                                                0.142
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.143
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.135
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.136
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.138
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.142
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.191
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.172
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.198
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | — | — | 
                                                16.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                16.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                19.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                19.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                20.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                19.6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                28.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                29.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                24.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Payout ratio | — | — | — | 
                                                0.413
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                0.423
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.437
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.350
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.356
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) operating activities | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                804,956,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,020,232,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,781,941,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                187,392,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,208,508,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -71,407,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -99,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -241,012,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -6,273,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -596,003,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -364,958,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                -336,131,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -410,065,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                -481,832,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -85,555,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | — | — | — | — | — | — | — | — | 
                                                3,759,855,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,391,266,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,806,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,675,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,899,019,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Number of employees | 
                                                52
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                225
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                46
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                329
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                225
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                554
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                329
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                606
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                554
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                600
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                599
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                603
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                592
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                589
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                571
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                568
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                547
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total shareholder return | — | — | — | — | — | — | — | — | — | — | — | 
                                                1.166
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1.160
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1.099
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.823
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.377
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total return on share price index | — | — | — | — | — | — | — | — | — | — | — | 
                                                1.962
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1.388
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1.312
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.286
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.905
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |