Revenues in Wireless Spectrum (Details Textual) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	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
Revenues and Gain on Sale of Rights in Wireless Spectrum (Textual)
Revenues	$ 2,769	$ 2,867	$ 2,781	$ 4,823	$ 3,303	$ 913	$ 453	$ 127	$ 13,240	$ 4,796	$ 1,130
Sales Revenue [Member]
Revenues and Gain on Sale of Rights in Wireless Spectrum (Textual)
Concentration risk percentage									10.00%
Straight Path IP Group [Member]
Revenues and Gain on Sale of Rights in Wireless Spectrum (Textual)
Revenues									$ 12,814	$ 4,372	$ 605
Total Settlement Amounts Aggregated									$ 18,300