Key Financial Data Of Group
| Concept | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | 2023-04-01 to 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | As at 2024-03-31 | 2022-04-01 to 2023-03-31 | As at 2023-03-31 | As at 2023-03-31 | 2022-04-01 to 2023-03-31 | 2021-04-01 to 2022-03-31 | 2021-04-01 to 2022-03-31 | As at 2022-03-31 | As at 2022-03-31 | As at 2021-03-31 | 2020-04-01 to 2021-03-31 | 2020-04-01 to 2021-03-31 | As at 2021-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | 2019-04-01 to 2020-03-31 | As at 2020-03-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||||||||||||||||
| Business results of group | ||||||||||||||||||||||
| Net sales | 
                                                42,871,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                42,871,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                34,343,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                34,343,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,081,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                51,082,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                30,085,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,085,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                24,725,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                24,781,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | 
                                                8,048,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,264,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                5,284,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                5,418,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,425,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,512,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                8,594,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,488,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,342,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,293,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | — | 
                                                5,507,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                3,772,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                14,507,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                6,892,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,678,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | — | 
                                                6,475,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                3,881,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                14,514,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                6,841,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,504,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | — | — | 
                                                56,475,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                56,141,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                52,006,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                52,413,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                51,089,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                50,939,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                38,557,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                38,546,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                32,579,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                32,278,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | — | — | 
                                                102,226,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                102,102,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                94,551,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                94,937,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                97,134,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                97,033,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                73,784,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                73,727,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                47,775,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                47,440,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | — | — | 
                                                443.62
                                                
                                             | — | 
                                                443.32
                                                
                                             | — | 
                                                410.86
                                                
                                             | 
                                                412.11
                                                
                                             | — | — | — | 
                                                406.57
                                                
                                             | 
                                                407.02
                                                
                                             | 
                                                306.31
                                                
                                             | — | — | 
                                                307.64
                                                
                                             | — | 
                                                257.92
                                                
                                             | — | 
                                                257.01
                                                
                                             | 
| Basic earnings (loss) per share | 
                                                51.00
                                                
                                             | — | 
                                                44.13
                                                
                                             | — | — | — | 
                                                29.67
                                                
                                             | — | — | 
                                                30.35
                                                
                                             | 
                                                116.77
                                                
                                             | 
                                                117.26
                                                
                                             | — | — | — | 
                                                57.33
                                                
                                             | 
                                                55.81
                                                
                                             | — | 
                                                22.23
                                                
                                             | — | 
                                                21.72
                                                
                                             | — | 
| Diluted earnings per share | 
                                                50.76
                                                
                                             | — | 
                                                43.92
                                                
                                             | — | — | — | 
                                                29.54
                                                
                                             | — | — | 
                                                30.22
                                                
                                             | 
                                                116.31
                                                
                                             | 
                                                116.80
                                                
                                             | — | — | — | 
                                                57.05
                                                
                                             | 
                                                55.53
                                                
                                             | — | 
                                                22.10
                                                
                                             | — | 
                                                21.59
                                                
                                             | — | 
| Equity-to-asset ratio | — | — | — | 
                                                0.542
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.542
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.542
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.542
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.518
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.519
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.513
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.516
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.666
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.668
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | 
                                                0.119
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.103
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.073
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.074
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.327
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.329
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.203
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.198
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.089
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.086
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | 
                                                16.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                19.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                47.6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                46.6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                19.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                19.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                62.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                64.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                105.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                108.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | 
                                                9,312,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -5,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,289,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                10,341,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                4,927,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | — | 
                                                -2,690,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                -15,002,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -3,250,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -3,290,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -4,161,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | — | 
                                                -2,031,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1,948,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -2,179,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                8,304,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,048,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | — | — | 
                                                18,756,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                13,278,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                30,733,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                26,260,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                10,928,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Number of employees | — | 
                                                900
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                934
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                934
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                900
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                854
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                879
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                816
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                797
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                732
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                719
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                667
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                654
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |