Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Revenue from External Customer [Line Items]
Revenues, Total	$ 362,316	$ 393,555
Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	351,849	385,082
Total net2phone [Member]
Revenue from External Customer [Line Items]
Revenues, Total	10,467	7,788
All Other [Member]
Revenue from External Customer [Line Items]
Revenues, Total		685
Boss Revolution Calling [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	123,513	132,184
Carrier Services [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	142,222	168,831
Mobile Top-Up [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	65,346	61,483
Other [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	14,595	18,027
Growth [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	6,173	4,557
net2phone-UCaaS [Member] | Total net2phone [Member]
Revenue from External Customer [Line Items]
Revenues, Total	4,805	2,398
net2phone-Platform Services [Member] | Total net2phone [Member]
Revenue from External Customer [Line Items]
Revenues, Total	$ 5,662	$ 5,390