Derivative Instruments - Effects of Cash Flow Hedges Included in Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2024	May 31, 2023	May 31, 2024	May 31, 2023
Derivative [Line Items]
Revenue	$ 820.2	$ 1,038.1	$ 2,491.7	$ 2,926.6
Cost of revenue	696.4	910.0	2,124.4	2,612.2
Interest and foreign exchange	24.7	22.8	72.5	64.0
Sales
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	0.9		1.9	(0.9)
Cost of Sales
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	0.2	0.5	0.1	1.1
Interest and Foreign Exchange
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	$ 4.3	$ 3.4	$ 12.8	$ 6.8