Income Taxes (Details 3) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Oct. 31, 2016	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Income Taxes [Abstract]
U.S. federal income tax at statutory rate		$ (2,667)	$ (10,314)	$ (32,271)
Valuation allowance		626
Foreign tax rate differential		3,107	6,035	25,757
Nondeductible expenses		457	487	659
Other		64	(67)	(73)
Prior year tax benefit (expense)		494	(231)
State and local income tax, net of federal benefit		(60)	(20)	(160)
Benefit from (provision for) income taxes	$ (16,600)	$ 2,021	$ (4,110)	$ (6,088)