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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2015
Oct. 06, 2015
Jan. 30, 2015
Entity Registrant Name IDT CORP    
Entity Central Index Key 0001005731    
Amendment Flag false    
Current Fiscal Year End Date --07-31    
Document Type 10-K    
Document Period End Date Jul. 31, 2015    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2015    
Trading Symbol IDT    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Filer Category Accelerated Filer    
Entity Public Float     $ 401.2
Class A common stock [Member]      
Entity Common Stock Shares Outstanding   1,574,326  
Class B common stock [Member]      
Entity Common Stock Shares Outstanding   21,752,240