Annual report pursuant to Section 13 and 15(d)

Commitments and Contingencies - Additional Information (Detail)

v3.10.0.1
Commitments and Contingencies - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Aug. 31, 2018
Aug. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Outstanding letters of credit $ 23.6 $ 22.1
Discounted present value of future minimum lease payments $ 11.0  
Weighted Average Discount Rate on Future Minimum Lease Payments 3.20%  
Sales to Iranian Distributors $ 0.5  
Sales possibly diverted to Crimea region of Ukraine $ 3.2