Quarterly report pursuant to Section 13 or 15(d)

Contingencies and Litigation - Additional Information (Details)

v3.8.0.1
Contingencies and Litigation - Additional Information (Details) - USD ($)
$ in Millions
Nov. 30, 2017
Aug. 31, 2017
Commitments and Contingencies Disclosure [Abstract]    
Outstanding letters of credit $ 14.3 $ 14.5
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]    
Discounted present value of future minimum lease payments $ 12.8  
Weighted Average Discount Rate on Future Minimum Lease Payments 2.62%