Schedule of Valuation and Qualifying Accounts (Details 1) - Allowance for uncollectible accounts receivable - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 11,663	$ 1,994	$ 2,574
Additions and adjustments charged to costs and expenses	292	11,837	17,056
Write-offs	(861)	(2,168)	(17,636)
Balance at end of period	$ 11,094	$ 11,663	$ 1,994