Business Segment Information (Details 1) - USD ($) $ in Thousands	Oct. 31, 2016	Jul. 31, 2016
Summary of total assets for the business segments
Total assets:	$ 11,712	$ 13,497
Straight Path Spectrum [Member]
Summary of total assets for the business segments
Total assets:	8,583	10,174
Straight Path IP Group [Member]
Summary of total assets for the business segments
Total assets:	2,029	2,223
Straight Path Ventures [Member]
Summary of total assets for the business segments
Total assets:	$ 1,100	$ 1,100