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Derivative Instruments - Effects of Cash Flow Hedges Included in Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Feb. 28, 2025	Feb. 29, 2024	Feb. 28, 2025	Feb. 29, 2024
Derivative [Line Items]
Revenue	$ 762.1	$ 862.7	$ 1,638.0	$ 1,671.5
Cost of revenue	623.5	740.5	1,325.8	1,428.0
Interest and foreign exchange	21.7	24.6	45.1	47.8
Sales
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	1.1	0.8	1.6	1.0
Cost of Sales
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	0.0	0.0	(0.1)	(0.1)
Interest and Foreign Exchange
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	$ 3.1	$ 4.2	$ 7.1	$ 8.5

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