The net operating loss carryforwards will start to expire in fiscal 2022, with fiscal 2015's loss expiring in fiscal 2035.

100.00%

$ 1,100

$ 7,000

Income Taxes (Details Textual) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
Income Taxes (Details Textual) - USD ($) $ in Thousands	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
Income Tax (Textual)
Operating loss carryforwards	$ 134,000								$ 134,000
Operating loss carryforwards expiration term									The net operating loss carryforwards will start to expire in fiscal 2022, with fiscal 2015's loss expiring in fiscal 2035.
Income tax expense (benefit)	2,660	$ 801	$ (100)	$ (755)	$ 2,393	$ (40)			$ 2,714	$ (2,353)	$ 8
Deferred income tax assets valuation allowance percentage									100.00%	100.00%
Winstar Holdings, LLC [Member]
Income Tax (Textual)
Suspended losses became available to offset taxable income									$ 3,000	$ 3,000
Income tax expense (benefit)										$ 1,100
Straight Path Spectrum [Member]
Income Tax (Textual)
Operating loss carryforwards	127,000								127,000
Straight Path IP Group [Member]
Income Tax (Textual)
Operating loss carryforwards	$ 7,000								$ 7,000