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Accounts Receivable, Net (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2012
Jul. 31, 2011
Jul. 31, 2010
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at Beginning of Year $ 3,122 $ 2,841 $ 2,405
Charged to Costs And Expenses 1,626 478 1,591
Deductions to Bad Debt (1,828) (197) (1,155)
Balance at End of Year $ 2,920 $ 3,122 $ 2,841