Accounts Receivable, Net (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance at beginning of year	$ 2,988	$ 3,584	$ 2,683
Charged to costs and expenses	3,646	2,221	3,376
Deductions to bad debt	(2,514)	(2,817)	(2,475)
Balance at end of year	$ 4,120	$ 2,988	$ 3,584