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Income Taxes (Details 3) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 31, 2016	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Income Taxes [Abstract]
U.S. federal income tax at statutory rate		$ (2,186)	$ (2,667)	$ (10,314)
Transition tax on foreign earnings		(3,360)
Valuation allowance		58,798	626
Foreign tax rate differential		(4,272)	3,107	6,035
Nondeductible expenses		213	457	487
Other		(23)	64	(67)
Prior year tax benefit (expense)		575	494	(231)
U.S. federal tax law change		(52,631)
State and local income tax, net of federal benefit		(16)	(60)	(20)
(PROVISION FOR) BENEFIT FROM INCOME TAXES	$ 16,600	$ (2,902)	$ 2,021	$ (4,110)

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