Contingencies and Litigation - Additional Information (Details) - USD ($) $ in Millions	May 31, 2016	Aug. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Outstanding letters of credit	$ 19.1	$ 18.1
Discounted present value of future minimum lease payments	$ 16.3

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

No definition available.

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant