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Income Taxes (Details 2) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 31, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Current:
Federal		$ 3,294		$ (83)
State and local		(34)	(26)	(30)
Foreign		11	(282)	(185)
Current income tax expense benefit		3,271	(308)	(298)
Deferred:
Federal			(9,536)	(3,148)
State and local		12	(66)	(51)
Foreign		(6,185)	11,931	(613)
Deferred income tax expense benefit		(6,173)	2,329	(3,812)
(PROVISION FOR) BENEFIT FROM INCOME TAXES	$ 16,600	$ (2,902)	$ 2,021	$ (4,110)

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