Schedule of Valuation and Qualifying Accounts (Details 1) - Allowance for uncollectible accounts receivable - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	Aug. 31, 2013
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 1,994	$ 2,574	$ 3,095
Additions and adjustments charged to costs and expenses	11,837	17,056	1,617
Write-offs	(2,168)	(17,636)	(2,138)
Balance at end of period	$ 11,663	$ 1,994	$ 2,574