Contingencies and Litigation - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Aug. 31, 2018	Feb. 28, 2019
Commitments and Contingencies Disclosure [Abstract]
Outstanding letters of credit	$ 23.6	$ 16.8
Discounted present value of future minimum lease payments		$ 10.0
Weighted Average Discount Rate on Future Minimum Lease Payments		3.00%
Sales to Iranian Distributors	$ 0.5