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Intangible Assets And Goodwill (Narrative) (Details) (USD $)
12 Months Ended
Aug. 31, 2012
Aug. 31, 2011
Aug. 31, 2010
Intangible Assets And Goodwill [Abstract]      
Duration of contingent payments from CoveyLink Acquisition 5 years    
Contingent earnout payment from CoveyLink acquisition    $ 5,411,000 $ 3,300,000
Aggregate amortization expense from definite-lived intangible assets $ 2,500,000 $ 3,500,000 $ 3,800,000