Business Segment Information (Details 1) - USD ($) $ in Thousands |
Jul. 31, 2016 |
Jul. 31, 2015 |
|---|---|---|
| Summary of total assets for the business segments | ||
| Total assets: | $ 13,497 | $ 20,238 |
| Straight Path Spectrum [Member] | ||
| Summary of total assets for the business segments | ||
| Total assets: | 10,174 | 5,637 |
| Straight Path IP Group [Member] | ||
| Summary of total assets for the business segments | ||
| Total assets: | 2,223 | 14,601 |
| Straight Path Ventures [Member] | ||
| Summary of total assets for the business segments | ||
| Total assets: | $ 1,100 |