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Stock-Based Compensation (Details Textual) - USD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 1 Months Ended 12 Months Ended
Sep. 24, 2012
Aug. 31, 2013
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Stock Based Compensation (Textual)          
Weighted-average grant date fair value of options granted during the period     $ 7.94    
Stock option awards, description     Option awards generally vest on a graded basis over three years of service and have ten-year contractual terms    
Total intrinsic value of options exercised during the period     $ 1.3 $ 0.2 $ 0.2
Total unrecognized compensation cost     $ 1.7    
Total unrecognized compensation cost, Weighted-average period of recognization     1 year 9 months 18 days    
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements     $ 6.1    
Total unrecognized compensation cost related to non-vested stock-based compensation arrangements, expected weighted-average period     1 year 6 months    
Total grant date fair value of shares vested     $ 5.6 $ 8.7 3.5
Straight Path Ip [Member]          
Stock Based Compensation (Textual)          
Percentage of grant approved by the Board of Directors 10.00%        
Share-based compensation expense         $ 0.7
Class B common stock [Member]          
Stock Based Compensation (Textual)          
Shares of common stock reserved for award under 2015 stock option and incentive plan     500    
Shares of common stock available for future grants     100    
Percentage of reduction in the exercise price   15.29%      
Fully vested outstanding options to purchase shares of Class B common stock   32,155