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Rafael Holdings, Inc. Spin-Off (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(LOSS) INCOME BEFORE INCOME TAXES	$ 8,101	$ 7,620	$ 29,468
Rafael Holdings, Inc. [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(LOSS) INCOME BEFORE INCOME TAXES	(2,410)	520	1,258
(LOSS) INCOME BEFORE INCOME TAXES ATTRIBUTABLE TO IDT CORPORATION	$ (2,107)	$ 517	$ 1,258

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