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Income Taxes (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Jul. 31, 2015
Jul. 31, 2014
Jul. 31, 2013
Income Tax Contingency [Line Items]      
Benefit from income taxes $ 6,088 $ 3,982 $ 15,872
Federal and state net operating loss carryforwards $ 170,000    
Net operating loss carryforwards expiration date 2016    
Net operating losses expiration date Jul. 31, 2036    
Foreign net operating losses $ 173,000    
Foreign net operating loss, no expiration 117,000    
Foreign net operating loss, expiration in two to ten years 56,000    
Losses limited under Internal Revenue Code 7,000    
Cumulative undistributed foreign earnings $ 353,000    
Accrued interest included in current income taxes payable  
Net2Phone [Member]      
Income Tax Contingency [Line Items]      
Net operating losses expiration description Expire through fiscal 2027.    
Net operating losses, Federal $ 84,000    
IDT Global [Member]      
Income Tax Contingency [Line Items]      
Benefit from income taxes   $ 4,100