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Accumulated Other Comprehensive Loss (Details) - Schedule of accumulated balances for each classification of other comprehensive loss - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance $ (34)
Adjustment from the adoption of change in accounting for equity investments (see Note 8)   33
Adjusted balance at August 1, 2018   (1)
Other comprehensive income (loss) attributable to IDT Corporation 42 1
Ending balance 42
Foreign currency translation [Member    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (4,858) (4,938)
Adjustment from the adoption of change in accounting for equity investments (see Note 8)  
Adjusted balance at August 1, 2018   (4,938)
Other comprehensive income (loss) attributable to IDT Corporation (2,594) 80
Ending balance (7,452) (4,858)
Accumulated other comprehensive income (loss) [Member]    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Beginning balance (4,858) (4,972)
Adjustment from the adoption of change in accounting for equity investments (see Note 8)   33
Adjusted balance at August 1, 2018   (4,939)
Other comprehensive income (loss) attributable to IDT Corporation (2,552) 81
Ending balance $ (7,410) $ (4,858)