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Stock Repurchase Plan (Details) (USD $)
In Thousands, except Share data
12 Months Ended
Jul. 31, 2010
Jul. 31, 2009
Jul. 31, 2011
Jul. 16, 2008
Mar. 09, 2006
Stock Repurchase Plan          
Number of shares authorized to repurchase         3,000,000
Additional number of shares authorized to repurchase       3,000,000  
Payments for repurchase of common stock $ 14,999 $ 22,367      
Number of shares repurchased since inception 4,264,804   4,264,804    
Value of stock repurchased since inception $ 162,827   $ 162,827    
Remaining shares available for repurchase under existing program     1,735,196