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Related Party Transactions (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Oct. 31, 2015 | Sep. 30, 2015 | Jul. 31, 2015 | Nov. 01, 2012 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016
Related Party Transactions (Textual) |  |  |  |  |  |  |
Number of Straight Path Class B common stock received |  |  | 64,624 |  |  |  |
Annual rent payment |  |  |  | $ 60,900 |  |  |
Lease period |  |  |  | 1 year |  |  |
Lease renewal period |  |  |  | 1 year |  |  |
Outstanding net loan receivable from employees |  |  |  |  | $ 200 | $ 200 |
Sale of shares |  |  |  |  | 41,502 | 47,996 | $ 35,011
Gain on sale of shares |  |  |  |  |  | 300 | 500
Straight Path [Member] |  |  |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |  |  |
Amount paid for straight path Class B common stock received |  |  | $ 2,100 |  |  |  |
Sale of shares |  | $ 2,600 |  |  |  |  |
Gain on sale of shares | $ 500 |  |  |  |  |  |
Jonas Media Group [Member] |  |  |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |  |  |
Receivable from subsidiaries included in other current assets |  |  |  |  | 17,000 | 22,000 |
Rent received for office space, connectivity and other services |  |  |  |  | 17,000 | 22,000 | 22,000
Zedge [Member] |  |  |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |  |  |
Receivable from subsidiaries included in other current assets |  |  |  |  | 34,000 | 100 |
Cost and expenses related to services |  |  |  |  | $ 300 | $ 1,000 | 600
Number of Straight Path Class B common stock received |  |  |  |  | 42,282 | 23,227 |
IGM Brokerage Corp. [Member] |  |  |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |  |  |
Commissions and fees from payment by company |  |  |  |  | $ 29,000 | $ 24,000 | 22,000
Rafael Pharmaceuticals, Inc. [Member] |  |  |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |  |  |
Receivable from subsidiaries included in other current assets |  |  |  |  | 1,000 | 600 |
Cost and expenses related to services |  |  |  |  | 400 | 600 |
Rafael Spin-Off [Member] |  |  |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |  |  |
Cost and expenses related to services |  |  |  |  | 200 |  |
Cash collected from third party tenants |  |  |  |  | 300 |  |
Owed amount |  |  |  |  | $ 400 |  |
Shares held |  |  |  |  | 25,803 |  |
Genie and Subsidiaries [Member] |  |  |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |  |  |
Receivable from subsidiaries included in other current assets |  |  |  |  | $ 300 | 200 |
Cost and expenses related to services |  |  |  |  | 1,300 | 1,600 | 2,200
Mason and Company [Member] |  |  |  |  |  |  |
Related Party Transactions (Textual) |  |  |  |  |  |  |
Commissions and fees from payment by company |  |  |  |  | $ 22,000 | $ 22,000 | $ 24,000

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