Receivables Schedule of Deferred Purchase Price (Details) - USD ($) $ in Thousands	6 Months Ended
	Feb. 28, 2018	Aug. 31, 2017	Feb. 28, 2017
Receivables [Abstract]
Receivables Securitization Facility, Amount	$ 700,000
Availability under Securitization Facility	618,000
Deferred purchase price receivable	517,759	$ 548,602	$ 0
Monthly settlements, net	(33,292)
Cash collections	(4,355)
Fair value adjustment	$ 6,804