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Equity (Tables)
9 Months Ended
Apr. 30, 2017
Equity [Abstract]  
Summary of changes in the components of equity
  Nine Months Ended
April 30, 2017
 
  Attributable to IDT Corporation  Noncontrolling Interests  Total 
  (in thousands) 
Balance, July 31, 2016 $123,797  $406  $124,203 
Dividends declared ($0.57 per share)  (13,155)     (13,155)
Sale of Class B common stock to Howard S. Jonas  10,000      10,000 
Restricted Class B common stock purchased from employees  (1,838)     (1,838)
Exercise of stock options  835      835 
Sale of interest and rights in Rafael Pharmaceuticals, Inc. to Howard S. Jonas (see Note 3)  (185)  1,185   1,000 
Issuance of member interests in CS Pharma Holdings, LLC (see Note 3)  1,850   8,150   10,000 
Distributions to noncontrolling interests     (1,139)  (1,139)
Stock-based compensation  2,793      2,793 
Comprehensive income:            
Net income  18,018   1,081   19,099 
Other comprehensive loss  (1,307)     (1,307)
Comprehensive income  16,711   1,081   17,792 
Balance, April 30, 2017 $140,808  $9,683  $150,491