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Accumulated Other Comprehensive Loss (Tables)
9 Months Ended
Apr. 30, 2019
Accumulated Other Comprehensive Loss [Abstract]  
Schedule of accumulated balances for each classification of other comprehensive income (loss)
  Unrealized
Gain (Loss) on Available-for-Sale Securities
  Foreign Currency Translation  Accumulated Other Comprehensive Loss 
  (in thousands) 
Balance, July 31, 2018 $(34) $(4,938) $(4,972)
Adjustment from the adoption of change in accounting for equity investments (see Note 8)  33      33 
Adjusted balance, August 1, 2018  (1)  (4,938)  (4,939)
Other comprehensive income attributable to IDT Corporation  1   473   474 
Balance, April 30, 2019 $  $(4,465) $(4,465)