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Nature Of Operations And Summary Of Significant Accounting Policies (Accrued Liabilities) (Details) (USD $)
In Thousands, unless otherwise specified
Aug. 31, 2012
Aug. 31, 2011
Nature Of Operations And Summary Of Significant Accounting Policies [Abstract]    
Accrued compensation $ 9,549 $ 7,854
Unearned revenue 4,780 4,710
Intellectual property royalties 1,907 1,702
Customer credits 1,421 2,341
Other accrued liabilities 6,873 6,206
Accrued liabilities $ 24,530 $ 22,813