Accounts Receivable, Net (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 4,942	$ 5,444	$ 4,311
Charged to costs and expenses	5,591	2,409	4,255
Write-offs to bad debt	(4,143)	(2,911)	(3,122)
Balance at end of year	$ 6,390	$ 4,942	$ 5,444