Revenues and Gain on Sale of Rights in Wireless Spectrum (Details Textual) (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2014 Straight Path IP Group [Member]	Jul. 31, 2013 Straight Path IP Group [Member]	Jul. 31, 2013 Straight Path Spectrum [Member]	Jul. 31, 2012 Straight Path Spectrum [Member]
Revenues and Gain on Sale of Rights in Wireless Spectrum (Textual)
Revenues	$ 4,796,000	$ 1,130,000	$ 4,372,000	$ 605,000
Total Settlement Amounts Aggregated			16,700,000	800,000
Cash Received from Exchange of Licenses						6,800,000
Gain on Exchange of Licenses		$ 150,000			$ 150,000	$ 5,300,000