Key Financial Data Of Reporting Company
| Concept | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2021-04-01 to 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | 2020-04-01 to 2021-03-31 | As at 2021-03-31 | As at 2021-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | |||||||||||||||||
| Business results of reporting company | |||||||||||||||||
| Net sales | 
                                                789,619,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                688,435,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                613,566,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                542,568,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                545,553,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Ordinary profit (loss) | 
                                                431,119,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                373,257,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                338,241,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                270,544,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                223,433,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Profit (loss) | 
                                                319,719,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                292,161,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                314,210,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                225,095,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                193,055,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Share capital | — | — | — | 
                                                103,001,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                103,001,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                103,001,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                103,001,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                103,001,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total number of issued shares | — | — | — | 
                                                1,809,663,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
                                                1,809,663,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
                                                1,809,663,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
                                                1,835,852,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
                                                1,861,787,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Net assets | — | — | — | 
                                                1,366,867,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,183,824,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,022,834,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                873,622,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                787,715,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | — | — | 
                                                2,559,271,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,458,895,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,488,925,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,388,556,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,350,771,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | — | — | 
                                                763.31
                                                
                                             | — | 
                                                660.00
                                                
                                             | — | — | — | 
                                                568.97
                                                
                                             | — | — | 
                                                477.81
                                                
                                             | — | — | — | 
                                                424.69
                                                
                                             | 
| Dividend paid per share | 
                                                74.00
                                                
                                             | — | — | — | — | — | — | 
                                                70.00
                                                
                                             | — | — | 
                                                60.00
                                                
                                             | 
                                                50.00
                                                
                                             | — | — | 
                                                42.00
                                                
                                             | — | — | 
| Interim dividend paid per share | 
                                                37.00
                                                
                                             | — | — | — | — | — | — | 
                                                35.00
                                                
                                             | — | — | 
                                                30.00
                                                
                                             | 
                                                25.00
                                                
                                             | — | — | 
                                                21.00
                                                
                                             | — | — | 
| Basic earnings (loss) per share | 
                                                178.59
                                                
                                             | — | — | — | — | — | — | 
                                                162.92
                                                
                                             | — | — | 
                                                172.64
                                                
                                             | 
                                                121.69
                                                
                                             | — | — | 
                                                103.95
                                                
                                             | — | — | 
| Diluted earnings per share | 
                                                178.55
                                                
                                             | — | — | — | — | — | — | 
                                                162.87
                                                
                                             | — | — | 
                                                172.57
                                                
                                             | 
                                                121.63
                                                
                                             | — | — | 
                                                103.89
                                                
                                             | — | — | 
| Equity-to-asset ratio | — | — | — | 
                                                0.534
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.481
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.687
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.629
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.583
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | 
                                                0.251
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                0.265
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.332
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.271
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.265
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Price-earnings ratio | 
                                                8.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                10.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                10.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                16.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Payout ratio | 
                                                0.414
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                0.430
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.348
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.411
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.404
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Number of employees | — | 
                                                13,643
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13,643
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,105
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,105
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,806
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,754
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                14,484
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,867
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                3,943
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,522
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                15,455
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,647
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total shareholder return | — | — | — | 
                                                1.043
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1.116
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.218
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                1.199
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.044
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total return on share price index | — | — | — | 
                                                2.134
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2.168
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.534
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                1.450
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.421
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |