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Rafael Holdings, Inc. Spin-Off (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss before income taxes	$ 3,286	$ (2,201)	$ 5,552	$ (2,405)
Rafael Holdings, Inc. Spin-Off [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss before income taxes		(1,190)		(2,410)
Loss before income taxes attributable to IDT Corporation		$ (1,062)		$ (2,107)

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