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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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Amount paid for related party shares received in connection with restricted stock.

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The Number of related party shares received in connection with restricted stock.

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The Number of related party shares received in connection with restricted stock.

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Related party transaction billings to related party for services.

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Related party transaction lease annual rent payments to related party.

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Related party transaction lessee leasing arrangements operating leases renewal term.

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Related party transaction lessee leasing arrangements operating leases term of contract.

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Related party transactions cash collected from third party tenants.

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Costs of sales and operating expenses for the period incurred from transactions with related parties.

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Amounts due from an Entity employee, not to include stockholders or officers, which are usually due within 1 year (or 1 business cycle).

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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