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Accounts Receivable, Net (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 3,584 $ 2,683 $ 2,920
Charged to costs and expenses 2,221 3,376 1,424
Deductions to bad debt (2,817) (2,475) (1,661)
Balance at end of year $ 2,988 $ 3,584 $ 2,683