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Accounts Receivable, Net (Details 1) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2019
Jul. 31, 2018
Jul. 31, 2017
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Balance at beginning of year $ 5,444 $ 4,311 $ 4,120
Charged to costs and expenses 2,409 4,255 2,928
Deductions to bad debt (2,911) (3,122) (2,737)
Balance at end of year $ 4,942 $ 5,444 $ 4,311