Key Financial Data Of Group
| Concept | As at 2025-03-31 | 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 | 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 | — | 
                                                381,661,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                363,366,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                338,831,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                302,746,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                275,181,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | 
                                                34,970,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                32,045,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                22,988,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                26,150,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                13,962,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                16,685,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,085,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,639,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                13,008,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                13,902,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | 
                                                27,631,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                19,612,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                12,227,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,535,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                10,116,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | 
                                                27,556,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                29,212,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                14,149,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                11,016,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                14,398,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | 
                                                184,283,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                160,364,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                167,231,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                146,217,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                127,324,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                147,165,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                136,897,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                119,599,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                135,849,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                119,068,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | 
                                                334,949,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                275,489,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                340,106,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                288,135,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                263,141,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                313,391,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                300,736,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                247,772,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                271,146,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                234,466,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | 
                                                2,720.64
                                                
                                             | — | — | — | 
                                                2,405.32
                                                
                                             | — | — | — | — | 
                                                2,476.38
                                                
                                             | 
                                                2,194.36
                                                
                                             | — | 
                                                1,914.70
                                                
                                             | 
                                                2,151.02
                                                
                                             | — | — | — | 
                                                2,009.35
                                                
                                             | 
                                                1,801.08
                                                
                                             | 
                                                1,907.64
                                                
                                             | — | — | 
                                                1,712.45
                                                
                                             | 
| Basic earnings (loss) per share | — | 
                                                416.15
                                                
                                             | — | — | — | — | 
                                                393.52
                                                
                                             | 
                                                269.29
                                                
                                             | 
                                                295.68
                                                
                                             | — | — | 
                                                163.23
                                                
                                             | — | — | 
                                                184.69
                                                
                                             | 
                                                171.58
                                                
                                             | 
                                                169.38
                                                
                                             | — | — | — | 
                                                142.82
                                                
                                             | 
                                                145.56
                                                
                                             | — | 
| Diluted earnings per share | — |  | — | — | — | — |  |  |  | — | — |  | — | — |  |  |  | — | — | — |  |  | — | 
| Equity-to-asset ratio | 
                                                0.539
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.582
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.483
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.507
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.484
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.455
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.442
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.483
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.487
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.508
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | — | 
                                                0.160
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.171
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.131
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.128
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.088
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.089
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.098
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.087
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.087
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.080
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | 
                                                13.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                14.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                18.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                16.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                12.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                11.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                10.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                10.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                12.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                11.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                5,885,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -13,100,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                25,826,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,186,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                22,568,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -1,405,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -8,103,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -5,427,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,042,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -324,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                -12,713,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -491,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -8,325,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -8,007,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                3,642,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | 
                                                41,364,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                49,064,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                69,971,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                56,867,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                62,271,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Number of employees | 
                                                5,858
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                5,591
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,365
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                264
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                5,606
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,230
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2,166
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,885
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                6,018
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2,131
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5,890
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                2,116
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |