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Rafael Holdings, Inc. Spin-Off (Tables)
6 Months Ended
Jan. 31, 2019
Rafael Holdings, Inc. Spin-Off [Member]  
Schedule of consolidated statements of operations

  Three Months Ended
January 31,
  Six Months Ended
January 31,
 
  2019  2018  2019  2018 
  (in thousands) 
Loss before income taxes $      —  $(680) $      —  $(1,220)
                 
Loss before income taxes attributable to IDT Corporation $  $(548) $  $(1,046)