Receivables - Reconciliation of the Beginning and Ending Balances of the DPP Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Deferred Purchase Price Receivable [Roll Forward]
Balance - beginning of year	$ 548,602	$ 0
Cash collections on DPP receivable	(10,961)	0
Transfer of receivables	(386,900)	580,509
Monthly settlements, net	(169,827)	(31,907)
Fair value adjustment	19,086	0
Balance - end of year	$ 0	$ 548,602