Key Financial Data Of Group
| Concept | 2023-06-01 to 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | 2023-06-01 to 2024-05-31 | As at 2024-05-31 | As at 2024-05-31 | As at 2023-05-31 | As at 2023-05-31 | 2022-06-01 to 2023-05-31 | 2022-06-01 to 2023-05-31 | 2021-06-01 to 2022-05-31 | 2021-06-01 to 2022-05-31 | As at 2022-05-31 | As at 2022-05-31 | 2020-06-01 to 2021-05-31 | As at 2021-05-31 | 2020-06-01 to 2021-05-31 | As at 2021-05-31 | 2019-06-01 to 2020-05-31 | As at 2020-05-31 | As at 2020-05-31 | 2019-06-01 to 2020-05-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of group | ||||||||||||||||||||||||||
| Business results of group | ||||||||||||||||||||||||||
| Net sales | 
                                                18,022,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1,670,073,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                17,410,527,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,361,433,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                16,148,259,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                800,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                14,397,766,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,000,230,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                14,842,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,008,001,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                2,020,158,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1,056,299,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                2,340,157,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                816,243,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,986,275,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                307,648,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                474,334,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                441,326,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                598,225,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                425,989,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) attributable to owners of parent | 
                                                1,233,250,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                1,533,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,228,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                264,759,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                258,226,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Comprehensive income | 
                                                1,242,090,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                1,541,109,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,237,169,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                269,611,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                270,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net assets | — | 
                                                4,271,417,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                5,776,464,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,078,045,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,768,220,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                4,024,995,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                3,460,244,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,024,370,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,431,613,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,964,735,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                2,746,897,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                6,603,146,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                11,469,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,860,916,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                5,953,098,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                8,574,913,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,496,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                6,477,818,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,422,252,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,404,216,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,762,841,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets per share | — | 
                                                553.75
                                                
                                             | — | — | — | — | — | — | — | 
                                                743.47
                                                
                                             | 
                                                653.01
                                                
                                             | 
                                                488.51
                                                
                                             | — | — | — | — | 
                                                508.61
                                                
                                             | 
                                                441.79
                                                
                                             | — | 
                                                381.58
                                                
                                             | — | 
                                                438.14
                                                
                                             | — | 
                                                383.32
                                                
                                             | 
                                                349.86
                                                
                                             | — | 
| Basic earnings (loss) per share | 
                                                159.88
                                                
                                             | — | — | — | — | — | — | 
                                                135.25
                                                
                                             | — | — | — | — | 
                                                197.80
                                                
                                             | 
                                                101.47
                                                
                                             | 
                                                156.83
                                                
                                             | 
                                                33.66
                                                
                                             | — | — | 
                                                33.95
                                                
                                             | — | 
                                                57.55
                                                
                                             | — | 
                                                33.69
                                                
                                             | — | — | 
                                                49.07
                                                
                                             | 
| Diluted earnings per share |  | — | — | — | — | — | — |  | — | — | — | — |  |  |  |  | — | — |  | — |  | — |  | — | — |  | 
| Equity-to-asset ratio | — | 
                                                0.647
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | 
                                                0.500
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.464
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.633
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.465
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.770
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.461
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.776
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.673
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.400
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Rate of return on equity | 
                                                0.229
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                0.260
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.340
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.218
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.352
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.077
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.093
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.140
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.099
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.133
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Price-earnings ratio | 
                                                14.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                17.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                6.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                12.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                39.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                17.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                10.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                20.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                13.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | 
                                                1,506,289,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                1,394,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,415,054,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                209,062,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                371,466,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -391,622,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                -562,611,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                52,204,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                114,386,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -119,465,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -740,987,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | 
                                                563,867,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -210,418,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -422,223,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -480,167,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | — | — | — | — | — | — | — | — | 
                                                6,653,088,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                6,279,408,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                4,883,224,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                2,626,384,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                2,725,159,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Number of employees | — | 
                                                25
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                747
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                277
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                25
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                203
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                203
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                82
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,512
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,445
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                18
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                1,328
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                16
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1,357
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                14
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                16
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,339
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Average number of temporary employees | — | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                23
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                56
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                21
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                11
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                116
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                96
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                90
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                113
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                135
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — |