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Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended
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Sep. 25, 2015 | Jun. 25, 2015 | Jan. 30, 2015 | Nov. 30, 2014 | Aug. 31, 2013 | Dec. 31, 2012 | Nov. 21, 2012 | Jul. 31, 2015 | Jul. 31, 2014 | Jul. 31, 2013
Equity (Textual) |  |  |  |  |  |  |  |  |  |
Voting rights description |  |  |  |  |  |  |  | The holders of Class A common stock are entitled to three votes per share and the holders of Class B common stock are entitled to one-tenth of a vote per share. |  |
Dividends paid |  |  |  |  |  |  |  | $ 47,600 | $ 13,600 | $ 17,100
Cash paid to purchase ownership percentage in subsidiary |  |  |  |  | $ 1,100 | $ 1,800 |  |  | 1,133 | 1,804
Ownership percentage increased in subsidiary |  |  |  |  | 2.80% | 4.50% |  |  |  |
Ownership percentage in subsidiary |  |  |  |  | 88.40% |  |  |  |  |
Cash received on sale of Zedge stock to Shaman II L.P |  |  |  |  |  |  | $ 100 |  |  |
Percentage of ownership after additional acquisition |  |  |  |  |  |  | 11.17% |  |  |
Percentage of ownership before additional acquisition |  |  |  |  |  |  | 11.10% |  |  |
Restricted Class B common stock purchased from employees |  |  |  |  |  |  |  | $ (2,777) | (1,005) | $ (301)
Straight Path [Member] |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |
Additional liability |  |  |  |  |  |  |  |  | 1,900 |
Additional Paid-in Capital [Member] |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |
Additional liability |  |  |  |  |  |  |  |  | $ 1,600 |
Board of Directors [Member] |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |
Common stock aggregate cash dividends declared |  |  | $ 0.64 | $ 0.68 |  |  |  |  |  |
Chairman of the Board [Member] |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |
Purchase price per share |  | $ 18.52 |  |  |  |  |  |  |  |
Stock repurchased in a fiscal year |  | 404,967 |  |  |  |  |  |  |  |
Aggregate purchase price of shares |  | $ 7,500 |  |  |  |  |  |  |  |
Class A common stock [Member] |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |
Common stock aggregate cash dividends declared |  |  |  |  |  |  |  | $ 2.03 | $ 0.59 | $ 0.75
Class A common stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |
Common stock dividends declared | $ 0.18 |  |  |  |  |  |  |  |  |
Paid date of declared dividend | Oct. 15, 2015 |  |  |  |  |  |  |  |  |
Record date of declared dividend | Oct. 07, 2015 |  |  |  |  |  |  |  |  |
Class B common stock [Member] |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |
Common stock aggregate cash dividends declared |  |  |  |  |  |  |  | $ 2.03 | $ 0.59 | $ 0.75
Stock repurchase program, shares authorized for repurchase |  |  |  |  |  |  |  | 8,300,000 |  |
Stock repurchased in a fiscal year |  |  |  |  |  |  |  | 29,675 |  | 77,843
Aggregate purchase price of shares |  |  |  |  |  |  |  | $ 400 |  | $ 800
Stock repurchase program, remaining number of shares authorized to be repurchased |  |  |  |  |  |  |  | 5,000,000 |  |
Class B common stock [Member] | Stock Repurchase Program [Member] |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |
Restricted Class B common stock purchased from employees |  |  |  |  |  |  |  | $ 2,800 | $ 1,000 | $ 300
Restricted Class B common stock purchased from employees, Shares |  |  |  |  |  |  |  | 152,856 | 34,206 | 30,998
Class B common stock [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Equity (Textual) |  |  |  |  |  |  |  |  |  |
Common stock dividends declared | $ 0.18 |  |  |  |  |  |  |  |  |
Paid date of declared dividend | Oct. 15, 2015 |  |  |  |  |  |  |  |  |
Record date of declared dividend | Oct. 07, 2015 |  |  |  |  |  |  |  |  |

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