Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2019
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Outstanding letters of credit	$ 23.6	$ 18.2
Discounted present value of future minimum lease payments		$ 9.1
Weighted Average Discount Rate on Future Minimum Lease Payments		1.90%
Sales to Iranian Distributors	$ 0.5