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Accounts Receivable, Net (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2018
Jul. 31, 2017
Jul. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward]      
Balance at beginning of year $ 4,311 $ 4,120 $ 2,988
Charged to costs and expenses 4,255 2,928 3,646
Deductions to bad debt (3,122) (2,737) (2,514)
Balance at end of year $ 5,444 $ 4,311 $ 4,120