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Rafael Holdings, Inc. Spin-Off (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss before income taxes	$ 2,225	$ 176	$ 2,267	$ (205)
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		(680)		(1,220)
Loss before income taxes attributable to IDT Corporation		$ (548)		$ (1,046)

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