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Accounts Receivable (Activity In Allowance For Doubtful Accounts) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Trade Accounts Receivable [Abstract]      
Beginning balance $ 798 $ 718 $ 879
Charged to costs and expense 224 188 402
Deductions (171) (108) (563)
Ending balance $ 851 $ 798 $ 718