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Other Operating Expense, Net (Details) - Schedule of other operating expense, net - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Schedule of other operating expense, net [Abstract]
Corporate—Straight Path Communications Inc. class action legal fees net of insurance claims	$ (306)	$ (160)	$ (4)	$ (421)
net2phone-UCaaS—other, net	(100)	(63)	(100)	(63)
Traditional Communications—gain from sale of rights under class action lawsuit	2,000		2,000
Traditional Communications—net2phone indemnification claim	(387)	(169)	(387)	(534)
Traditional Communications—Carrier Services settlement			(554)
Traditional Communications—accrual for non-income related taxes related to a foreign subsidiary				(2,150)
Total other operating gain (expense), net	$ 1,207	$ (392)	$ 955	$ (3,168)