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Revenue Recognition (Details 1) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2019
Jan. 31, 2018
Outside the United States:        
Total outside the United States $ 115,673 $ 123,829 $ 242,169 $ 253,523
Revenues, Total 349,473 395,883 711,789 789,438
United States [Member]        
Outside the United States:        
Revenues, Total 233,800 272,054 469,620 535,915
United Kingdom [Member]        
Outside the United States:        
Total outside the United States 49,083 54,782 103,483 115,313
Netherlands [Member]        
Outside the United States:        
Total outside the United States 48,057 47,152 98,979 96,861
Other [Member]        
Outside the United States:        
Total outside the United States 18,533 21,895 39,707 41,349
Telecom & Payment Services [Member]        
Outside the United States:        
Total outside the United States 112,244 121,993 236,203 249,879
Revenues, Total 337,950 387,065 689,799 772,148
Telecom & Payment Services [Member] | United States [Member]        
Outside the United States:        
Revenues, Total 225,706 265,072 453,596 522,269
Telecom & Payment Services [Member] | United Kingdom [Member]        
Outside the United States:        
Total outside the United States 49,075 54,782 103,467 115,313
Telecom & Payment Services [Member] | Netherlands [Member]        
Outside the United States:        
Total outside the United States 48,057 47,152 98,979 96,861
Telecom & Payment Services [Member] | Other [Member]        
Outside the United States:        
Total outside the United States 15,112 20,059 33,757 37,705
Total net2phone [Member]        
Outside the United States:        
Total outside the United States 3,429 1,836 5,966 3,644
Revenues, Total 11,523 8,299 21,990 16,087
Total net2phone [Member] | United States [Member]        
Outside the United States:        
Revenues, Total 8,094 6,463 16,024 12,443
Total net2phone [Member] | United Kingdom [Member]        
Outside the United States:        
Total outside the United States 8 16
Total net2phone [Member] | Netherlands [Member]        
Outside the United States:        
Total outside the United States
Total net2phone [Member] | Other [Member]        
Outside the United States:        
Total outside the United States 3,421 1,836 5,950 3,644
All Other [Member]        
Outside the United States:        
Total outside the United States
Revenues, Total 519 1,203
All Other [Member] | United States [Member]        
Outside the United States:        
Total outside the United States      
Revenues, Total 519 1,203
All Other [Member] | United Kingdom [Member]        
Outside the United States:        
Total outside the United States
All Other [Member] | Netherlands [Member]        
Outside the United States:        
Total outside the United States
All Other [Member] | Other [Member]        
Outside the United States:        
Total outside the United States