Income Taxes (Details 2) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Current:
Federal			$ (83)
State and local		(26)	(30)
Foreign		(282)	(185)	(311)
Current income tax expense benefit		(308)	(298)	(311)
Deferred:
Federal		(9,536)	(3,148)	(1,967)
State and local		(66)	(51)	(245)
Foreign		11,931	(613)	(3,565)
Deferred income tax expense benefit		2,329	(3,812)	(5,777)
BENEFIT FROM (PROVISION FOR) INCOME TAXES	$ (16,600)	$ 2,021	$ (4,110)	$ (6,088)