Receivables Schedule of Deferred Purchase Price (Details) - USD ($) $ in Thousands	3 Months Ended
	Nov. 30, 2017	Aug. 31, 2017	Nov. 30, 2016
Receivables [Abstract]
Receivables Securitization Facility, Amount	$ 700,000
Availability under Securitization Facility	700,000
Deferred purchase price receivable	521,502	$ 548,602	$ 0
Monthly settlements, net	$ (27,100)