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Accumulated Other Comprehensive Loss (Tables)
9 Months Ended
Apr. 30, 2020
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of accumulated balances for each classification of other comprehensive loss
   Unrealized
Gain (Loss) on
Available-for-
Sale Securities
   Foreign
Currency
Translation
   Accumulated
Other
Comprehensive
Loss
 
   (in thousands) 
Balance, July 31, 2019  $   $(4,858)  $(4,858)
Other comprehensive income (loss) attributable to IDT Corporation   84    (2,364)   (2,280)
Balance, April 30, 2020  $84   $(7,222)  $(7,138)