Revenue Recognition (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Outside the United States:
Total outside the United States	$ 113,058	$ 122,762
Revenues, Total	340,245	362,316
United States [Member]
Outside the United States:
Revenues, Total	227,187	239,554
United Kingdom [Member]
Outside the United States:
Total outside the United States	35,797	50,480
Netherlands [Member]
Outside the United States:
Total outside the United States	54,942	50,922
Other [Member]
Outside the United States:
Total outside the United States	22,319	21,360
Telecom & Payment Services [Member]
Outside the United States:
Total outside the United States	108,963	120,225
Revenues, Total	327,618	351,849
Telecom & Payment Services [Member] | United States [Member]
Outside the United States:
Revenues, Total	218,655	231,624
Telecom & Payment Services [Member] | United Kingdom [Member]
Outside the United States:
Total outside the United States	35,793	50,472
Telecom & Payment Services [Member] | Netherlands [Member]
Outside the United States:
Total outside the United States	54,942	50,922
Telecom & Payment Services [Member] | Other [Member]
Outside the United States:
Total outside the United States	18,228	18,831
net2phone [Member]
Outside the United States:
Total outside the United States	4,095	2,537
Revenues, Total	12,627	10,467
net2phone [Member] | United States [Member]
Outside the United States:
Revenues, Total	8,532	7,930
net2phone [Member] | United Kingdom [Member]
Outside the United States:
Total outside the United States	4	8
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	$ 4,091	$ 2,529