Derivative Instruments - Effects of Cash Flow Hedges Included in Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2022	May 31, 2021	May 31, 2022	May 31, 2021
Derivative [Line Items]
Revenue	$ 793.5	$ 450.2	$ 2,027.0	$ 1,148.8
Cost of revenue	717.2	375.0	1,848.3	1,015.3
Interest and foreign exchange	14.9	10.2	39.3	30.9
Sales
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	(0.6)	(0.5)	(1.0)	(1.1)
Cost of Sales
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	0.1		0.1	(0.1)
Interest and Foreign Exchange
Derivative [Line Items]
Amount of gain (loss) on cash flow hedge activity	$ (1.7)	$ (1.3)	$ (4.3)	$ (3.9)