Business Segment Information (Details 1) - USD ($) $ in Thousands	Apr. 30, 2016	Jul. 31, 2015
Summary of total assets for the business segments
Total assets:	$ 15,621	$ 20,238
Straight Path Spectrum [Member]
Summary of total assets for the business segments
Total assets:	11,441	5,637
Straight Path IP Group [Member]
Summary of total assets for the business segments
Total assets:	3,080	$ 14,601
Straight Path Ventures [Member]
Summary of total assets for the business segments
Total assets:	$ 1,100