Segment Information - Reconciliation of Earnings from Operations to Earnings Before Income Tax and Earnings from Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2023	May 31, 2022
Segment Reporting [Abstract]
Earnings from operations	$ 50.7	$ 19.6	$ 113.3	$ 56.6
Interest and foreign exchange	22.8	14.9	64.0	39.3
Earnings before income tax and earnings from unconsolidated affiliates	$ 27.9	$ 4.7	$ 49.3	$ 17.3