Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Revenue from External Customer [Line Items]
Revenues, Total	$ 341,255	$ 365,410	$ 1,053,044	$ 1,154,848
Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	328,838	356,362	1,018,637	1,128,510
Total net2phone [Member]
Revenue from External Customer [Line Items]
Revenues, Total	12,417	9,086	34,407	25,172
All Other [Member]
Revenue from External Customer [Line Items]
Revenues, Total		(38)		1,166
Boss Revolution Calling [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	120,455	129,649	366,114	393,454
Carrier Services [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	120,955	142,525	391,073	482,159
Mobile Top-Up [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	67,567	62,530	197,189	186,144
Other [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	12,202	15,954	43,730	51,464
Growth [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	7,659	5,704	20,531	15,289
net2phone-UCaaS [Member] | Total net2phone [Member]
Revenue from External Customer [Line Items]
Revenues, Total	6,651	3,704	17,483	9,334
net2phone-Platform Services [Member] | Total net2phone [Member]
Revenue from External Customer [Line Items]
Revenues, Total	$ 5,766	$ 5,382	$ 16,924	$ 15,838