Commitments and Contingencies (Details) (USD $)	0 Months Ended	1 Months Ended		12 Months Ended		0 Months Ended	12 Months Ended			0 Months Ended	12 Months Ended									0 Months Ended
	Apr. 15, 2013	Jul. 31, 2013	Apr. 30, 2013	Jul. 31, 2013	Jul. 31, 2012	Jun. 06, 2013 Former Chief Executive Officer [Member]	Jul. 31, 2013 Former Chief Executive Officer [Member]	Jul. 31, 2013 Straight Path Spectrum [Member]	Jul. 31, 2012 Straight Path Spectrum [Member]	Jun. 06, 2013 Straight Path Spectrum [Member] Former Chief Executive Officer [Member]	Jul. 31, 2013 Straight Path Spectrum [Member] Former Chief Executive Officer [Member]	Jul. 31, 2013 Straight Path Spectrum [Member] 39 GHz Economic Area [Member] License	Jul. 31, 2013 Straight Path Spectrum [Member] 39 GHz Rectangular Service Area [Member] License	Jul. 31, 2013 Straight Path Spectrum [Member] LMDS 28 GHz range [Member] License	Jul. 31, 2013 Straight Path Spectrum [Member] LMDS 28 GHz range [Member] Licenses expire on august 10, 2018 [Member] License	Jul. 31, 2013 Straight Path Spectrum [Member] LMDS 28 GHz range [Member] Licenses expire on september 21,2018 [Member] License	Jul. 31, 2013 Straight Path Spectrum [Member] NEW YORK LMDS 28 GHz range [Member]	Jul. 31, 2013 Straight Path IP [Member]	Jul. 31, 2012 Straight Path IP [Member]	Mar. 15, 2013 Straight Path IP [Member] Former Chief Executive Officer [Member]
Commitments and Contingencies (Textual)
Outstanding common stock of Straight Path IP Percentage	0.50%																			5.00%
Compensatory damages																				$ 35,000,000
Cash payment											1,500,000
Description of future payment										The future payments shall equal 50% of revenues, net of certain expenses, received from such activities with respect to the covered licenses that are to be retained by Straight Path Spectrum, up to a maximum of $3 million.
Amount of additional future payment for wireless spectrum licenses						500,000
Amount of maximum future payment for wireless spectrum licenses						3,000,000
Amount of increase future payment for wireless spectrum licenses						4,000,000
Transferred value of licenses, intangible asset							300,000
Loss on settlement of Straight Path Spectrum legal proceedings				(1,150,000)			1,200,000	(1,150,000)
Gain on sale of rights in wireless spectrum				150,000	5,330,000			150,000	5,330,000
Monthly rent		8,800	800	8,800
Rental expense, operating leases				$ 13,000	$ 15,000
Lease agreement description		Satellite office in Englewood Cliffs, New Jersey for one year commencing on August 1, 2013 and ending on July 31, 2014 for aggregate rent of $8,800.	Corporate headquarters in Richmond, Virginia for a term of twelve months beginning on May 1, 2013 and ending on April 30, 2014 at a monthly rent of $800.
License expiration date								Oct. 18, 2020				Oct. 18, 2020	Jun. 30, 2017		Aug. 10, 2018	Sep. 21, 2018	Feb. 01, 2016	Sep. 25, 2015
Number of licenses												814	34	133
Licenses to be expired															14	118