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Segment Information - Reconciliation of Earnings from Operations to Earnings Before Income Tax and Earnings (Loss) from Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Aug. 31, 2021 | Aug. 31, 2020 | Aug. 31, 2019
Segment Reporting [Abstract] |  |  |
Earnings (loss) from operations | $ 40,970 | $ 168,429 | $ 184,116
Interest and foreign exchange | 43,263 | 43,619 | 30,912
Net loss on extinguishment of debt | 6,287 |  |
Earnings (loss) before income tax and earnings (loss) from unconsolidated affiliates | $ (8,580) | $ 124,810 | $ 153,204

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