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Accounts Receivable (Activity In Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2015
Accounts Receivable [Abstract]      
Beginning balance $ 1,579 $ 1,333 $ 918
Charged to costs and expenses 1,747 2,022 699
Deductions (1,016) (1,776) (284)
Ending balance $ 2,310 $ 1,579 $ 1,333