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Other Operating (Losses) Gains, Net (Details Textual) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 24, 2017	Apr. 30, 2017	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Other Operating (Losses) Gains, Net (Textual)
Expense related to legal settlement and mutual release, including legal fees		$ 10,100
Legal fees			$ 1,700
Sale of majority interests in New SPIP			6,000
Gain on sale of interest					$ 1,086
Payment for transfer of the IP Interest			(6,000)
Straight Path [Member]
Other Operating (Losses) Gains, Net (Textual)
Expense related to legal settlement and mutual release, including legal fees				10,000
Legal fees related to the FCC investigation				900
Proceeds related to FCC investigation				$ 500
Legal fees			$ 1,700
Aggregate cash paid	$ 16,000
Intellectual property net proceeds receive percentage	22.00%
Settlement agreement, description			The Settlement Agreement and Release allocates (i) $10 million of the payment and the retained interest right to the settlement of claims and the mutual release and (ii) $6 million to the transfer of the IP Interest.
Payment for settlement of claims and mutual release	$ 10,000
Payment for transfer of the IP Interest	6,000
Fabrix Systems Ltd. [Member]
Other Operating (Losses) Gains, Net (Textual)
Gain on sale of interest					$ 1,100
PR-SP IP Holdings LLC [Member]
Other Operating (Losses) Gains, Net (Textual)
Sale of majority interests in New SPIP	$ 6,000

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