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Accounts Receivable, Net (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2017
Jul. 31, 2016
Jul. 31, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 4,120 $ 2,988 $ 3,584
Charged to costs and expenses 2,928 3,646 2,221
Deductions to bad debt (2,737) (2,514) (2,817)
Balance at end of year $ 4,311 $ 4,120 $ 2,988