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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended
Oct. 31, 2017
Oct. 31, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance $ 154,557  
Dividends declared ($0.19 per share) (4,720)  
Restricted Class B common stock purchased from employees (23)  
Distributions to noncontrolling interests (380)  
Stock-based compensation 810  
Comprehensive income:    
Net loss (1,797) $ 22,294
Other comprehensive loss (398) (2,885)
Comprehensive income (2,195) $ 19,409
Ending Balance 148,049  
Attributable to IDT Corporation [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 145,734  
Dividends declared ($0.19 per share) (4,720)  
Restricted Class B common stock purchased from employees (23)  
Distributions to noncontrolling interests  
Stock-based compensation 810  
Comprehensive income:    
Net loss (2,092)  
Other comprehensive loss (398)  
Comprehensive income (2,490)  
Ending Balance 139,311  
Noncontrolling Interests [Member]    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Beginning Balance 8,823  
Dividends declared ($0.19 per share)  
Restricted Class B common stock purchased from employees  
Distributions to noncontrolling interests (380)  
Stock-based compensation  
Comprehensive income:    
Net loss 295  
Other comprehensive loss  
Comprehensive income 295  
Ending Balance $ 8,738