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Rafael Holdings, Inc. Spin-Off (Tables)
9 Months Ended
Apr. 30, 2019
Rafael Holdings, Inc. Spin-Off [Member]  
Schedule of consolidated statements of operations
  Three Months Ended
April 30,
  Nine Months Ended
April 30,
 
  2019  2018  2019  2018 
  (in thousands) 
Loss before income taxes $  $(1,190) $  $(2,410)
Loss before income taxes attributable to IDT Corporation $  $(1,062) $  $(2,107)