Business Segment Information (Details 1) - USD ($) $ in Thousands	Apr. 30, 2017	Jul. 31, 2016
Summary of total assets for the business segments
Total assets:	$ 20,947	$ 13,497
Straight Path Spectrum [Member]
Summary of total assets for the business segments
Total assets:	4,048	10,174
Straight Path IP Group [Member]
Summary of total assets for the business segments
Total assets:	15,799	2,223
Straight Path Ventures [Member]
Summary of total assets for the business segments
Total assets:	$ 1,100	$ 1,100