Key Financial Data Of Group
| Concept | As at 2025-03-31 | As at 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | As at 2025-03-31 | 2024-04-01 to 2025-03-31 | 2023-04-01 to 2024-03-31 | 2023-04-01 to 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 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||||||||||||||||
| Business results of group | ||||||||||||||||||||||
| 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
                                                    
                                                
                                             | — | — | 
| 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
                                                
                                             | 
| 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
                                                    
                                                
                                             | — | — | 
| Number of employees | 
                                                13,643
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,105
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                13,643
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                4,105
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                14,754
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4,806
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                4,867
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                14,484
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                14,522
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3,943
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15,455
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                4,647
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Revenue | — | — | — | 
                                                1,912,323,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,603,672,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,518,619,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,296,163,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,249,528,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) before tax | — | — | — | 
                                                31,237,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                24,969,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                132,361,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                156,886,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                145,324,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss), attributable to owners of parent | — | — | — | 
                                                50,747,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                17,045,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                98,714,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                124,086,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                120,589,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income, attributable to owners of parent | — | — | — | 
                                                48,888,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                205,583,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                205,277,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                208,117,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                181,499,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Equity attributable to owners of parent | — | — | 
                                                1,513,255,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,595,988,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,507,954,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,460,308,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,386,115,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Total assets | — | — | 
                                                3,339,544,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                3,569,603,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,456,518,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,332,395,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,273,628,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Owners' equity per share | — | — | 
                                                845.25
                                                
                                             | — | — | — | — | — | 
                                                890.07
                                                
                                             | — | — | — | 
                                                839.26
                                                
                                             | — | — | — | 
                                                799.26
                                                
                                             | — | 
                                                748.03
                                                
                                             | — | — | — | 
| Basic earnings (loss) per share | — | — | — | 
                                                28.35
                                                
                                             | — | — | — | 
                                                9.51
                                                
                                             | — | — | — | — | — | 
                                                54.24
                                                
                                             | — | 
                                                67.08
                                                
                                             | — | — | — | — | 
                                                64.93
                                                
                                             | — | 
| Diluted earnings (loss) per share | — | — | — | 
                                                28.24
                                                
                                             | — | — | — | 
                                                9.47
                                                
                                             | — | — | — | — | — | 
                                                54.09
                                                
                                             | — | 
                                                67.05
                                                
                                             | — | — | — | — | 
                                                64.90
                                                
                                             | — | 
| Ratio of owners' equity to gross assets | — | — | 
                                                0.453
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                0.447
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.614
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.626
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.610
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
| Rate of return on equity | — | — | — | 
                                                0.033
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.011
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                0.067
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.087
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.090
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | — | — | 
                                                51.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                172.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                34.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                28.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                26.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Cash flows from (used in) operating activities | — | — | — | 
                                                194,512,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                172,475,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                327,767,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                257,444,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                306,843,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from (used in) investing activities | — | — | — | 
                                                -89,419,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -845,802,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -84,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -62,413,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -81,894,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash flows from (used in) financing activities | — | — | — | 
                                                -261,367,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                614,060,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -195,623,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -216,298,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -229,479,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | — | 
                                                188,372,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                335,687,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                376,840,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                315,986,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                326,128,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — |