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Accounts Receivable (Activity In Allowance For Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Aug. 31, 2019
Aug. 31, 2018
Aug. 31, 2017
Accounts Receivable [Abstract]      
Beginning balance $ 3,555 $ 2,310 $ 1,579
Charged to costs and expenses 1,212 2,029 1,747
Deductions (525) (784) (1,016)
Ending balance $ 4,242 $ 3,555 $ 2,310