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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 |  |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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