Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Jan. 31, 2021	Jan. 31, 2020
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	$ 339,766	$ 323,890	$ 683,191	$ 664,089
Outside the United States:
Total outside the United States	50,274	104,325	97,899	217,382
Fintech [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	18,497	9,741	38,585	19,298
Outside the United States:
Total outside the United States
net2phone- UCaaS [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	10,738	7,915	20,366	15,122
Outside the United States:
Total outside the United States	5,061	4,220	9,608	8,155
Traditional Communications [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	310,531	306,234	624,240	629,669
Outside the United States:
Total outside the United States	45,213	100,105	88,291	209,227
United States [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	289,492	219,565	585,292	446,707
United States [Member] | Fintech [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	18,497	9,741	38,585	19,298
United States [Member] | net2phone- UCaaS [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	5,677	3,695	10,758	6,967
United States [Member] | Traditional Communications [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	265,318	206,129	535,949	420,442
United Kingdom [Member]
Outside the United States:
Total outside the United States	31,929	36,154	61,350	71,950
United Kingdom [Member] | Fintech [Member]
Outside the United States:
Total outside the United States
United Kingdom [Member] | net2phone- UCaaS [Member]
Outside the United States:
Total outside the United States		3		7
United Kingdom [Member] | Traditional Communications [Member]
Outside the United States:
Total outside the United States	31,929	36,151	61,350	71,943
Netherlands [Member]
Outside the United States:
Total outside the United States	5	49,692	7	104,634
Netherlands [Member] | Fintech [Member]
Outside the United States:
Total outside the United States
Netherlands [Member] | net2phone- UCaaS [Member]
Outside the United States:
Total outside the United States
Netherlands [Member] | Traditional Communications [Member]
Outside the United States:
Total outside the United States	5	49,692	7	104,634
Other [Member]
Outside the United States:
Total outside the United States	18,340	18,479	36,542	40,798
Other [Member] | Fintech [Member]
Outside the United States:
Total outside the United States
Other [Member] | net2phone- UCaaS [Member]
Outside the United States:
Total outside the United States	5,061	4,217	9,608	8,148
Other [Member] | Traditional Communications [Member]
Outside the United States:
Total outside the United States	$ 13,279	$ 14,262	$ 26,934	$ 32,650