Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2016	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015
Current:
Federal														$ 39
State and local													(13)	(35)	(34)
Total													(13)	4	(34)
Deferred:
Federal															(2,211)
State and local															(469)
Total															2,809
INCOME TAX BENEFITS (PROVISION FOR INCOME TAXES)	$ 3	$ 3	$ 0	$ 7	$ 15	$ (25)	$ 0	$ 6	$ 2,660	$ (801)	$ 100	$ 755	$ 13	$ (4)	$ 2,714