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Revenue Recognition (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Outside the United States:        
Total outside the United States $ 96,682 $ 116,151 $ 314,064 $ 355,046
Revenues, Total 321,336 341,255 985,425 1,053,044
United States [Member]        
Outside the United States:        
Revenues, Total 224,654 225,104 671,361 697,998
United Kingdom [Member]        
Outside the United States:        
Total outside the United States 26,363 44,479 98,314 143,906
Netherlands [Member]        
Outside the United States:        
Total outside the United States 52,237 48,817 156,870 147,796
Other [Member]        
Outside the United States:        
Total outside the United States 18,082 22,855 58,880 63,344
Telecom & Payment Services [Member]        
Outside the United States:        
Total outside the United States 92,480 112,567 301,433 345,496
Revenues, Total 308,790 328,838 947,342 1,018,637
Telecom & Payment Services [Member] | United States [Member]        
Outside the United States:        
Revenues, Total 216,310 216,271 645,909 673,141
Telecom & Payment Services [Member] | United Kingdom [Member]        
Outside the United States:        
Total outside the United States 26,360 44,476 98,304 143,887
Telecom & Payment Services [Member] | Netherlands [Member]        
Outside the United States:        
Total outside the United States 52,237 48,817 156,870 147,796
Telecom & Payment Services [Member] | Other [Member]        
Outside the United States:        
Total outside the United States 13,883 19,274 46,259 53,813
net2phone [Member]        
Outside the United States:        
Total outside the United States 4,202 3,584 12,631 9,550
Revenues, Total 12,546 12,417 38,083 34,407
net2phone [Member] | United States [Member]        
Outside the United States:        
Revenues, Total 8,344 8,833 25,452 24,857
net2phone [Member] | United Kingdom [Member]        
Outside the United States:        
Total outside the United States 3 3 10 19
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 $ 4,199 $ 3,581 $ 12,621 $ 9,531