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Revolving Credit Facility (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 12, 2012
Jul. 31, 2018
Revolving Credit Facility (Textual)    
Maximum principal amount of credit agreement $ 25.0  
Unused outstanding amount $ 25.0  
Line of credit termination date   Jul. 20, 2018
Average percentage of commitment fee per annum 0.325%  
Interest rate,description   The principal outstanding incurred interest per annum, at the option of IDT Telecom, at either (a) the U.S. Prime Rate less 125 basis points, or (b) the LIBOR rate adjusted by the Regulation D maximum reserve requirement plus 125 basis points.