Key Financial Data Of Reporting Company
| Concept | As at 2024-08-31 | As at 2024-08-31 | 2023-09-01 to 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | 2023-09-01 to 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2024-08-31 | As at 2023-08-31 | As at 2023-08-31 | 2022-09-01 to 2023-08-31 | 2022-09-01 to 2023-08-31 | 2021-09-01 to 2022-08-31 | As at 2022-08-31 | 2021-09-01 to 2022-08-31 | As at 2022-08-31 | 2020-09-01 to 2021-08-31 | As at 2021-08-31 | As at 2021-08-31 | 2020-09-01 to 2021-08-31 | 2019-09-01 to 2020-08-31 | As at 2020-08-31 | 2019-09-01 to 2020-08-31 | As at 2020-08-31 | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Key financial data of reporting company | ||||||||||||||||||||||||||||
| Business results of reporting company | ||||||||||||||||||||||||||||
| Net sales | — | — | 
                                                4,877,111,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                17,694,365,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                12,548,788,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                4,004,237,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                7,374,639,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                2,993,744,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                7,534,636,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                4,072,874,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                8,389,713,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                4,720,865,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Ordinary profit (loss) | — | — | 
                                                378,969,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                1,362,680,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                416,454,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                242,209,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                396,760,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                57,469,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                528,604,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                412,345,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                758,263,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                466,402,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Profit (loss) | — | — | 
                                                336,651,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                124,328,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                59,547,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                466,715,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                420,745,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
| Share capital | — | — | — | — | — | — | 
                                                1,176,968,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1,176,968,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,176,968,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,176,968,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | 
                                                1,176,968,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total number of issued shares | — | — | — | — | — | — | 
                                                6,800,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                7,360,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | 
                                                7,360,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | 
                                                7,360,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | — | — | — | — | 
                                                7,360,000
                                                
                                                    
                                                        xbrli:shares
                                                    
                                                
                                             | 
| Net assets | — | — | — | — | — | — | 
                                                9,377,642,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,058,966,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                11,163,929,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,237,245,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                9,209,858,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,727,988,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                9,735,120,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                9,310,884,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                9,449,489,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                8,992,097,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Total assets | — | — | — | — | — | — | 
                                                14,608,695,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                22,405,569,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                21,886,443,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                14,342,556,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                11,257,444,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                14,482,132,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                12,220,672,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
                                                10,458,609,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                12,287,351,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                10,411,105,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | 
| Net assets per share | — | — | — | — | — | — | 
                                                1,432.88
                                                
                                             | — | — | 
                                                1,842.58
                                                
                                             | — | — | 
                                                1,706.41
                                                
                                             | 
                                                1,411.84
                                                
                                             | — | — | — | 
                                                1,415.36
                                                
                                             | — | 
                                                1,495.47
                                                
                                             | — | 
                                                1,501.73
                                                
                                             | 
                                                1,435.70
                                                
                                             | — | — | 
                                                1,459.25
                                                
                                             | — | 
                                                1,388.06
                                                
                                             | 
| Dividend paid per share | — | — | 
                                                35.0
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                30.0
                                                
                                             | — | — | 
                                                15.0
                                                
                                             | — | — | — | — | 
                                                25.0
                                                
                                             | — | — | 
                                                25.0
                                                
                                             | — | 
| Interim dividend paid per share | — | — |  | — | — | — | — | — | — | — | — | — | — | — | — |  | — | — |  | — | — | — | — |  | — | — |  | — | 
| Basic earnings (loss) per share | — | — | 
                                                51.46
                                                
                                             | — | — | 
                                                167.33
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                234.33
                                                
                                             | 
                                                19.13
                                                
                                             | 
                                                23.99
                                                
                                             | — | 
                                                9.24
                                                
                                             | — | 
                                                66.48
                                                
                                             | — | — | 
                                                72.64
                                                
                                             | 
                                                83.01
                                                
                                             | — | 
                                                65.49
                                                
                                             | — | 
| Diluted earnings per share | — | — | 
                                                51.44
                                                
                                             | — | — | 
                                                167.25
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                232.76
                                                
                                             | 
                                                19.00
                                                
                                             | 
                                                23.71
                                                
                                             | — | 
                                                9.13
                                                
                                             | — | 
                                                65.26
                                                
                                             | — | — | 
                                                71.31
                                                
                                             | 
                                                81.70
                                                
                                             | — | 
                                                64.46
                                                
                                             | — | 
| Equity-to-asset ratio | — | — | — | — | — | — | 
                                                0.642
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.538
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.510
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.644
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.813
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.668
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.789
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.882
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.763
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.857
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Rate of return on equity | — | — | 
                                                0.036
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.094
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                0.146
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.014
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.016
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.006
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.045
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.051
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                0.058
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                0.048
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Price-earnings ratio | — | — | 
                                                21.6
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                6.7
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                3.9
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                47.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                23.3
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                60.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                11.0
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                10.1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                8.2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                10.4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Payout ratio | — | — | 
                                                0.680
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | — | — | — | — | 
                                                1.568
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                1.623
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.344
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                0.382
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
| Net cash provided by (used in) operating activities | — | — | — | — | — | 
                                                -186,664,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                668,100,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -519,153,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                1,481,512,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                3,509,670,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) investing activities | — | — | — | — | — | 
                                                -455,404,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                -1,503,483,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                -673,585,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -850,853,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -304,655,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Net cash provided by (used in) financing activities | — | — | — | — | — | 
                                                -202,700,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | — | — | 
                                                2,151,568,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                550,172,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -405,895,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                -1,913,985,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
| Cash and cash equivalents | — | — | — | — | — | — | — | — | — | 
                                                5,524,306,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
                                                6,369,076,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                5,052,891,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | 
                                                5,695,456,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | — | 
                                                5,470,693,000
                                                
                                                    
                                                        JPY
                                                    
                                                
                                             | — | — | 
| Number of employees | 
                                                37
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                17
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                17
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                45
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                118
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                272
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                43
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                564
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                150
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                101
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                507
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                117
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                115
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                282
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                257
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                110
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                264
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                108
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Average number of temporary employees | 
                                                4
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                1
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                2
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                70
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                83
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                121
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                31
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                69
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                100
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                56
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                35
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                45
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                64
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
                                                55
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | 
                                                74
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | 
                                                63
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total shareholder return | — | — | — | — | — | — | 
                                                1.295
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1.040
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                0.649
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.814
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                0.734
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | 
| Total return on share price index | — | — | — | — | — | — | 
                                                2.024
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | — | — | 
                                                1.701
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | 
                                                1.393
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                1.359
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             | — | — | — | — | 
                                                1.098
                                                
                                                    
                                                        xbrli:pure
                                                    
                                                
                                             |