Key Financial Data Of Group
| Concept | 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 | 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 | — | 
                                                6,811,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                6,579,127,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,697,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                4,838,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                5,576,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Operating revenue | 
                                                212,772,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                149,938,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                143,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                145,782,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                145,512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Ordinary profit (loss) | 
                                                92,816,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                536,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                40,294,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                431,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                30,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                252,039,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                23,031,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                195,260,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                210,500,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) attributable to owners of parent | — | 
                                                372,540,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                358,821,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                189,561,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                153,953,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                167,197,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Comprehensive income | — | 
                                                401,905,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                383,112,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                204,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                160,552,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                159,936,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets | — | — | 
                                                2,470,562,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,159,986,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,062,653,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,068,761,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,685,825,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,021,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,481,955,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                998,192,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,321,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                978,373,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | — | 
                                                8,366,632,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,280,513,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,235,289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,273,419,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                6,782,521,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,262,236,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,471,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,218,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,046,233,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,191,189,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | — | 
                                                2,030.28
                                                
                                             | 
                                                962.80
                                                
                                             | — | 
                                                881.93
                                                
                                             | 
                                                1,703.68
                                                
                                             | — | — | — | 
                                                1,394.79
                                                
                                             | 
                                                847.89
                                                
                                             | 
                                                1,227.84
                                                
                                             | — | — | 
                                                828.26
                                                
                                             | — | 
                                                1,095.70
                                                
                                             | — | 
                                                811.81
                                                
                                             | 
| Basic earnings (loss) per share | 
                                                70.83
                                                
                                             | 
                                                309.54
                                                
                                             | — | — | 
                                                27.37
                                                
                                             | — | — | 
                                                298.08
                                                
                                             | 
                                                14.68
                                                
                                             | 
                                                157.47
                                                
                                             | — | — | — | 
                                                12.62
                                                
                                             | 
                                                127.88
                                                
                                             | — | 
                                                0.23
                                                
                                             | — | 
                                                138.88
                                                
                                             | — | 
| Diluted earnings per share |  |  | — | — |  | — | — |  |  |  | — | — | — |  |  | — |  | — |  | — | 
| Equity-to-asset ratio | — | — | 
                                                0.292
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.906
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.860
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.282
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.248
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.810
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.228
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.819
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.218
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.821
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | 
                                                0.076
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.166
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.031
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.192
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.017
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.120
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.015
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.110
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.000
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.135
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | 
                                                70.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                32.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                3.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                47.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                4.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                53.6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2,260.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                3.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | 
                                                -17,673,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -115,329,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                245,395,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -331,833,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                291,737,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) investing activities | — | 
                                                -108,723,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                201,034,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -112,405,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                -66,118,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -36,749,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) financing activities | — | 
                                                492,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -17,122,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -171,990,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                385,546,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -170,376,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Cash and cash equivalents | — | — | 
                                                861,694,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                495,199,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                426,617,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                465,618,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                478,023,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Number of employees | — | — | 
                                                131
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                131
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                123
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                125
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                123
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |