Business Segment Information (Details 1) - USD ($) $ in Thousands	Oct. 31, 2017	Jul. 31, 2017
Summary of total assets for the business segments
Total assets	$ 10,097	$ 11,850
Straight Path Spectrum [Member]
Summary of total assets for the business segments
Total assets	8,997	8,740
Straight Path Ventures [Member]
Summary of total assets for the business segments
Total assets	$ 1,100	$ 1,100