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Inventories - Inventory Valuation (Detail) - Inventory Valuation Reserve - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2025	Aug. 31, 2024	Aug. 31, 2023
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 6.3	$ 17.2	$ 14.1
Charge to cost of revenue	3.8	1.2	5.4
Disposition of inventory	(2.6)	(12.2)	(2.7)
Currency translation effect	0.2	0.1	0.4
Balance at end of period	$ 7.7	$ 6.3	$ 17.2

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