Schedule of Valuation and Qualifying Accounts (Details 2) - Reserve for inventory obsolescence - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2015
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 32,221	$ 43,477	$ 49,431
Additions and adjustments charged to costs and expenses	46,030	12,145	10,826
Write-offs	(32,238)	(23,401)	(16,780)
Balance at end of period	$ 46,013	$ 32,221	$ 43,477