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Schedule of Impact of Acquisition's Purchase Price Allocations on Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	Apr. 30, 2021	Jul. 31, 2020
Business Acquisition [Line Items]
Goodwill	$ 14,943	$ 12,858
IDT International Telecom, Inc [Member]
Business Acquisition [Line Items]
Trade accounts receivable	656
Prepaid expenses	1,644
Property, plant and equipment	75
Goodwill	2,025
Customer relationships (15-year useful lives)	1,960
Tradenames (20-year useful lives)	440
Deferred income tax assets	197
Other assets	30
Trade accounts payable	(1,306)
Accrued expenses	(423)
Other current liabilities	(329)
Noncontrolling interests	(2,188)
Net assets excluding cash acquired	$ 2,781

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