Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	$ 343,425	$ 340,200
Total outside the United States	47,625	113,058
Fintech [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	20,087	9,557
Total outside the United States
net2phone [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	9,628	7,207
Total outside the United States	4,546	3,935
Traditional Communications [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	313,710	323,436
Total outside the United States	43,079	109,123
United States [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	295,800	227,142
United States [Member] | Fintech [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	20,087	9,557
United States [Member] | net2phone [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	5,082	3,272
United States [Member] | Traditional Communications [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Revenues, Total	270,631	214,313
United Kingdom [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States	29,421	35,797
United Kingdom [Member] | Fintech [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States
United Kingdom [Member] | net2phone [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States		4
United Kingdom [Member] | Traditional Communications [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States	29,421	35,793
Netherlands [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States	2	54,942
Netherlands [Member] | Fintech [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States
Netherlands [Member] | net2phone [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States
Netherlands [Member] | Traditional Communications [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States	2	54,942
Other [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States	18,202	22,319
Other [Member] | Fintech [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States
Other [Member] | net2phone [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States	4,546	3,931
Other [Member] | Traditional Communications [Member]
Revenue Recognition (Details) - Schedule of revenues disaggregated by geographic region [Line Items]
Total outside the United States	$ 13,656	$ 18,388