Employee Benefit Plan (Details Textuals) - USD ($) $ in Millions	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, contributions by employer, percentage	20.00%
Maximum employer contribution on employees salary deferral	15.00%
Recognized deferred compensation expenses	$ 0.9	$ 0.8	$ 0.8
Foreign Plan [Member]
Defined Contribution Plan Disclosure [Line Items]
Defined contribution plan, contributions by employer, percentage	5.00%
Recognized deferred compensation expenses	$ 0.6	$ 0.6	$ 0.7