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Valuation And Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Allowance For Doubtful Accounts [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period $ 4,857 $ 2,853 $ 1,717
Charges to costs and expenses 5,840 2,225 1,543
Deductions 991 221 407
Balance at end of period 9,706 4,857 2,853
Allowance For Inventory Obsolescence [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Balance at beginning of period 2,858 3,089 1,648
Charges to costs and expenses 3,302 698 2,632
Charged to other accounts 147 (11) (71)
Deductions 1,608 940 1,262
Balance at end of period 4,405 $ 2,858 $ 3,089
Deferred Tax Asset Valuation Allowance [Member]      
Valuation and Qualifying Accounts Disclosure [Line Items]      
Charges to costs and expenses 2,949    
Balance at end of period $ 2,949