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Revolving Credit Facility	12 Months Ended
Revolving Credit Facility	Jul. 31, 2018
Revolving Credit Facility [Abstract]
Revolving Credit Facility	Note 11—Revolving Credit Facility The Company’s subsidiary, IDT Telecom, entered into a credit agreement, dated July 12, 2012, with TD Bank, N.A. for a line of credit facility for up to a maximum principal amount of $25.0 million. The credit agreement was terminated on July 20, 2018. 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. IDT Telecom paid a quarterly unused commitment fee of 0.325% per annum on the average daily balance of the unused portion of the $25.0 million commitment. At July 31, 2017, there were no amounts borrowed or utilized for letters of credit under the credit facility.