Key Financial Data Of Reporting Company
| Concept | 2023-06-01 to 2024-05-31 | As at 2024-05-31 | 2023-06-01 to 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 reporting company | ||||||||||||||||||||
| Business results of reporting company | ||||||||||||||||||||
| Net sales | 
                                                37,207,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,903,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                37,509,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,846,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                36,668,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,675,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                34,334,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,039,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                30,394,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                862,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Ordinary profit (loss) | 
                                                4,597,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,439,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                4,624,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,321,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,706,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                1,201,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,054,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                673,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                3,203,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                576,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Profit (loss) | — | — | 
                                                1,435,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,320,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                1,196,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                670,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                559,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Share capital | — | 
                                                2,803,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,803,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                2,803,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                2,803,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,000,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Total number of issued shares | — | 
                                                16,078,920
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
                                                16,078,920
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | — | 
                                                16,078,920
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
                                                16,078,920
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | 
                                                7,261,060
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | 
| Net assets | — | 
                                                26,200,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                32,592,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                29,869,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,417,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                27,544,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                24,743,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                25,497,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                24,500,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                21,757,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                20,324,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Total assets | — | 
                                                26,479,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                41,423,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                39,194,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,859,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                39,240,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                25,349,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                37,513,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                25,278,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                22,709,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                31,185,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Net assets per share | — | 
                                                1,670.93
                                                
                                             | — | 
                                                2,078.04
                                                
                                             | 
                                                1,910.56
                                                
                                             | 
                                                1,626.26
                                                
                                             | — | — | — | — | 
                                                1,763.46
                                                
                                             | 
                                                1,584.59
                                                
                                             | — | 
                                                1,601.13
                                                
                                             | — | 
                                                1,538.91
                                                
                                             | — | 
                                                1,599.02
                                                
                                             | 
                                                1,493.72
                                                
                                             | — | 
| Dividend paid per share | — | — | 
                                                55
                                                
                                             | — | — | — | — | 
                                                50
                                                
                                             | — | 
                                                43
                                                
                                             | — | — | — | — | 
                                                35
                                                
                                             | — | — | — | — | 
                                                50
                                                
                                             | 
| Interim dividend paid per share | — | — |  | — | — | — | — |  | — |  | — | — | — | — |  | — | — | — | — |  | 
| Basic earnings (loss) per share | 
                                                193.62
                                                
                                             | — | 
                                                91.66
                                                
                                             | — | — | — | 
                                                195.32
                                                
                                             | 
                                                84.52
                                                
                                             | 
                                                197.46
                                                
                                             | 
                                                75.67
                                                
                                             | — | — | 
                                                187.47
                                                
                                             | — | 
                                                45.13
                                                
                                             | — | 
                                                149.15
                                                
                                             | — | — | 
                                                41.12
                                                
                                             | 
| Diluted earnings per share |  | — |  | — | — | — |  |  |  |  | — | — |  | — |  | — |  | — | — |  | 
| Equity-to-asset ratio | — | 
                                                0.989
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.787
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.762
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.983
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.702
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.976
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.680
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.969
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.958
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.652
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Rate of return on equity | 
                                                0.097
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.056
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.106
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.053
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.118
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.049
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.122
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.029
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.105
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.026
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Price-earnings ratio | 
                                                9.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                19.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                7.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                17.5
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                5.8
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                15.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                5.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                23.6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                5.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                19.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Payout ratio | — | — | 
                                                0.600
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.592
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.568
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.776
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.608
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Net cash provided by (used in) operating activities | 
                                                3,940,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1,382,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                956,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,397,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                5,088,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | 
                                                -941,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -1,487,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -505,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -752,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -2,247,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | 
                                                -1,058,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                -924,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -1,315,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,631,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                393,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | — | — | 
                                                17,935,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                15,994,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | 
                                                17,023,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                17,888,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                13,356,000,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Number of employees | — | 
                                                20
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1,713
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,721
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                25
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                1,686
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                26
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1,621
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                23
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                19
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1,517
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Average number of temporary employees | — | — | — | 
                                                328
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                307
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                253
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                256
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                248
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Total shareholder return | — | 
                                                3.711
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                3.049
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                2.336
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                2.101
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1.502
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
| Total return on share price index | — | 
                                                2.070
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.554
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | 
                                                1.358
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.333
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1.062
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — |