Revenue Recognition (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Outside the United States:
Total outside the United States	$ 104,325	$ 116,133	$ 217,382	$ 238,895
Revenues, Total	323,890	349,473	664,089	711,789
United States [Member]
Outside the United States:
Revenues, Total	219,565	233,340	446,707	472,894
United Kingdom [Member]
Outside the United States:
Total outside the United States	36,154	48,947	71,950	99,427
Netherlands [Member]
Outside the United States:
Total outside the United States	49,692	48,057	104,634	98,979
Other [Member]
Outside the United States:
Total outside the United States	18,479	19,129	40,798	40,489
Telecom & Payment Services [Member]
Outside the United States:
Total outside the United States	99,990	112,704	208,953	232,929
Revenues, Total	310,980	337,950	638,552	689,799
Telecom & Payment Services [Member] | United States [Member]
Outside the United States:
Revenues, Total	210,990	225,246	429,599	456,870
Telecom & Payment Services [Member] | United Kingdom [Member]
Outside the United States:
Total outside the United States	36,151	48,939	71,943	99,411
Telecom & Payment Services [Member] | Netherlands [Member]
Outside the United States:
Total outside the United States	49,692	48,057	104,634	98,979
Telecom & Payment Services [Member] | Other [Member]
Outside the United States:
Total outside the United States	14,147	15,708	32,376	34,539
net2phone [Member]
Outside the United States:
Total outside the United States	4,335	3,429	8,429	5,966
Revenues, Total	12,910	11,523	25,537	21,990
net2phone [Member] | United States [Member]
Outside the United States:
Revenues, Total	8,575	8,094	17,108	16,024
net2phone [Member] | United Kingdom [Member]
Outside the United States:
Total outside the United States	3	8	7	16
net2phone [Member] | Netherlands [Member]
Outside the United States:
Total outside the United States
net2phone [Member] | Other [Member]
Outside the United States:
Total outside the United States	$ 4,332	$ 3,421	$ 8,422	$ 5,950