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Segment Information - Reconciliation of Earnings from Operations to Earnings (Loss) Before Income Tax and Earnings from Unconsolidated Affiliates (Detail) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2022	Aug. 31, 2021	Aug. 31, 2020
Segment Reporting [Abstract]
Earnings (loss) from operations	$ 118.0	$ 41.0	$ 168.4
Interest and foreign exchange	57.4	43.3	43.6
Net loss on extinguishment of debt		6.3
Earnings (loss) before income tax and earnings from unconsolidated affiliates	$ 60.6	$ (8.6)	$ 124.8

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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