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Trade Accounts Receivable (Activity In Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2015
Aug. 31, 2014
Aug. 31, 2013
Trade Accounts Receivable [Abstract]      
Beginning balance $ 918 $ 982 $ 851
Charged to costs and expenses 699 141 190
Deductions (284) (205) (59)
Ending balance $ 1,333 $ 918 $ 982