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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, 2024 | Nov. 30, 2023
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |
Interest and foreign exchange | $ 23.4 | $ 23.2
Total before tax | (88.4) | (41.7)
Income tax expense | 33.4 | 10.0
Unrealized Gain 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 | (4.4) | (4.4)
Income tax expense | 0.9 | 0.9
Net of tax | (3.5) | (3.5)
Unrealized Gain 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 | (0.4) | (0.1)
Unrealized Gain 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 | $ (4.0) | $ (4.3)

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