Revenue Recognition (Details 1) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Outside the United States:
Total outside the United States	$ 116,736	$ 120,474	$ 358,905	$ 373,996
Revenues, Total	341,255	365,410	1,053,044	1,154,848
United States [Member]
Outside the United States:
Revenues, Total	224,519	244,936	694,139	780,852
United Kingdom [Member]
Outside the United States:
Total outside the United States	46,580	49,475	150,063	164,788
Netherlands [Member]
Outside the United States:
Total outside the United States	48,817	47,757	147,796	144,618
Other [Member]
Outside the United States:
Total outside the United States	21,339	23,242	61,046	64,590
Telecom & Payment Services [Member]
Outside the United States:
Total outside the United States	113,152	118,448	349,355	368,327
Revenues, Total	328,838	356,362	1,018,637	1,128,510
Telecom & Payment Services [Member] | United States [Member]
Outside the United States:
Revenues, Total	215,686	237,914	669,282	760,183
Telecom & Payment Services [Member] | United Kingdom [Member]
Outside the United States:
Total outside the United States	46,577	49,474	150,044	164,787
Telecom & Payment Services [Member] | Netherlands [Member]
Outside the United States:
Total outside the United States	48,817	47,757	147,796	144,618
Telecom & Payment Services [Member] | Other [Member]
Outside the United States:
Total outside the United States	17,758	21,217	51,515	58,922
Total net2phone [Member]
Outside the United States:
Total outside the United States	3,584	2,026	9,550	5,669
Revenues, Total	12,417	9,086	34,407	25,172
Total net2phone [Member] | United States [Member]
Outside the United States:
Revenues, Total	8,833	7,060	24,857	19,503
Total net2phone [Member] | United Kingdom [Member]
Outside the United States:
Total outside the United States	3	1	19	1
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	3,581	2,025	9,531	5,668
All Other [Member]
Outside the United States:
Total outside the United States
Revenues, Total		(38)		1,166
All Other [Member] | United States [Member]
Outside the United States:
Total outside the United States
Revenues, Total		(38)		1,166
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