Revolving Credit Facility (Details Narrative) - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2022	Jan. 31, 2021	May 17, 2021
Line of Credit Facility [Line Items]
Repayments of lines of credit	$ 2,488
Proceeds from lines of credit	2,488
IDT Telecom [Member]
Line of Credit Facility [Line Items]
Repayments of lines of credit	2,500
Proceeds from lines of credit	$ 2,500
Revolving Credit Facility [Member] | TD Bank [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity			$ 25,000
Line of Credit Facility, Description	The revolving credit facility is secured by primarily all of IDT Telecom’s assets. The principal outstanding bears interest per annum at the Intercontinental Exchange Benchmark Administration Ltd. LIBOR multiplied by the Regulation D maximum reserve requirement plus 125 to 175 basis points, depending upon IDT Telecom’s leverage ratio as computed for the most recent fiscal quarter. Interest is payable monthly, and all outstanding principal and any accrued and unpaid interest is due on May 16, 2024. IDT Telecom pays a quarterly unused commitment fee on the average daily balance of the unused portion of the $ 25.0 million commitment of 30 to 85 basis points, depending upon IDT Telecom’s leverage ratio as computed for the most recent fiscal quarter
Line of Credit Facility, Remaining Borrowing Capacity			$ 25,000