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Accumulated Other Comprehensive Loss - Amounts Reclassified out of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Nov. 30, 2022 | Nov. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Interest and foreign exchange | $ 19.6 | $ 12.6
Total before tax | 24.4 | 0.8
Income tax expense | (3.8) | (1.4)
Unrealized (Gain) Loss on Derivative Financial Instruments | Reclassification out of Accumulated Other Comprehensive loss |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Total before tax | (0.8) | 1.5
Income tax expense | 0.3 | (0.5)
Net of tax | (0.5) | 1.0
Unrealized (Gain) Loss on Derivative Financial Instruments | Reclassification out of Accumulated Other Comprehensive loss | Foreign Exchange Contracts |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Revenue and Cost of revenue | 0.2 | 1.3
Unrealized (Gain) Loss on Derivative Financial Instruments | Reclassification out of Accumulated Other Comprehensive loss | Interest rate swap contracts |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Interest and foreign exchange | $ (1.0) | $ 0.2

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