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Zedge Spin-Off (Tables)
6 Months Ended
Jan. 31, 2017
Disposition Of Subsidiary [Abstract]  
Schedule of consolidated statements of income

  Three Months Ended
January 31,
  Six Months Ended 
January 31,
 
  2017  2016  2017  2016 
  (in thousands) 
Income before income taxes $  $1,976  $  $2,226 
                 
Income before income taxes attributable to IDT Corporation $  $1,757  $  $1,978