Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	Aug. 31, 2014
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	$ 9,706	$ 4,857	$ 2,853
Charges to costs and expenses	800	5,840	2,225
Deductions	2,194	991	221
Balance at end of period	8,312	9,706	4,857
Allowance For Inventory Obsolescence [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	4,405	2,858	3,089
Charges to costs and expenses	1,262	3,302	698
Charged to other accounts	(30)	(147)	11
Deductions	980	1,608	940
Balance at end of period	4,656	4,405	$ 2,858
Deferred Tax Asset Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period	2,949
Charges to costs and expenses		2,949
Deductions	124
Balance at end of period	$ 2,825	$ 2,949