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IDT Financial Services Holding Limited Assets and Liabilities Held for Sale (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
IDT Financial Services Holding Limited [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
(LOSS) INCOME BEFORE INCOME TAXES (1,111) (1,577) 7,532
(LOSS) INCOME BEFORE INCOME TAXES ATTRIBUTABLE TO IDT CORPORATION $ (1,111) $ (1,577) $ 7,532