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Equity (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Jan. 31, 2017
Jan. 31, 2016
Changes in the components of equity        
Beginning Balance     $ 124,203  
Dividends declared ($0.38 per share)     (8,765)  
Restricted Class B common stock purchased from employees     (1,838)  
Exercise of stock options     835  
Issuance of member interests in CS Pharma Holdings, LLC     10,000  
Distributions to noncontrolling interests     (817)  
Stock-based compensation     2,128  
Comprehensive income:        
Net income $ 1,257 $ 4,663 23,552 $ 9,240
Other comprehensive loss 419 (4,154) (2,466) (3,515)
Comprehensive income 1,676 $ 509 21,086 $ 5,725
Ending Balance 146,832   146,832  
Attributable to IDT Corporation [Member]        
Changes in the components of equity        
Beginning Balance     123,797  
Dividends declared ($0.38 per share)     (8,765)  
Restricted Class B common stock purchased from employees     (1,838)  
Exercise of stock options     835  
Issuance of member interests in CS Pharma Holdings, LLC     1,850  
Distributions to noncontrolling interests      
Stock-based compensation     2,128  
Comprehensive income:        
Net income     22,794  
Other comprehensive loss     (2,466)  
Comprehensive income     20,328  
Ending Balance 138,335   138,335  
Noncontrolling Interests [Member]        
Changes in the components of equity        
Beginning Balance     406  
Dividends declared ($0.38 per share)      
Restricted Class B common stock purchased from employees      
Exercise of stock options      
Issuance of member interests in CS Pharma Holdings, LLC     8,150  
Distributions to noncontrolling interests     (817)  
Stock-based compensation      
Comprehensive income:        
Net income     758  
Other comprehensive loss      
Comprehensive income     758  
Ending Balance $ 8,497   $ 8,497