Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2015	Oct. 31, 2014
Summary of operating results for the business segments
Revenues	$ 1,703	$ 4,823
(Loss) income from operations	(691)	1,612
Straight Path Spectrum
Summary of operating results for the business segments
Revenues	105	96
(Loss) income from operations	(334)	(297)
Straight Path IP
Summary of operating results for the business segments
Revenues	1,598	4,727
(Loss) income from operations	$ (357)	$ 1,909