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Rafael Holdings, Inc. Spin-Off (Tables) - Rafael Holdings Inc. Spin Off [Member]
 12 Months Ended
Jul. 31, 2018
Schedule of assets and liabilities held for sale
(in thousands)   
Cash and cash equivalents $9,287 
Marketable securities  32,989 
Trade accounts receivable  53 
Other current assets  2,329 
Property, plant and equipment, net  50,624 
Investments  17,650 
Other assets  2,240 
Current liabilities  (159)
Other liabilities  (94)
Noncontrolling interests  (8,653)
Rafael equity $106,266 
Schedule of consolidated statements of operations
Year ended July 31
(in thousands)		 2018  2017  2016 
(LOSS) INCOME BEFORE INCOME TAXES $(2,410) $520  $1,258 
             
(LOSS) INCOME BEFORE INCOME TAXES ATTRIBUTABLE TO IDT CORPORATION $(2,107) $517  $1,258 
Schedule of consolidated balance sheets
July 31
(in thousands)		 2018  2017 
Convertible promissory note (at fair value) $—  $6,300 
Warrants (at cost)  —   5,400 
Right to receive additional shares (at cost)  —   400 
Total investment in Rafael Pharma $—  $12,100