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Segment Information - Reconciliation of Earnings from Operations to Earnings (Loss) Before Income Tax and Earnings from Unconsolidated Affiliates (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Aug. 31, 2022 | Aug. 31, 2021 | Aug. 31, 2020
Segment Reporting [Abstract] |  |  |
Earnings (loss) from operations | $ 118.0 | $ 41.0 | $ 168.4
Interest and foreign exchange | 57.4 | 43.3 | 43.6
Net loss on extinguishment of debt |  | 6.3 |
Earnings (loss) before income tax and earnings from unconsolidated affiliates | $ 60.6 | $ (8.6) | $ 124.8

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