Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Revenue from External Customer [Line Items]
Revenues, Total	$ 349,473	$ 395,883	$ 711,789	$ 789,438
Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	337,950	387,065	689,799	772,148
Total net2phone [Member]
Revenue from External Customer [Line Items]
Revenues, Total	11,523	8,299	21,990	16,087
All Other [Member]
Revenue from External Customer [Line Items]
Revenues, Total		519		1,203
Boss Revolution Calling [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	122,146	131,621	245,659	263,805
Carrier Services [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	127,896	170,804	270,118	339,634
Mobile Top-Up [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	64,276	62,131	129,623	123,615
Other [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	16,603	17,480	31,197	35,509
Growth [Member] | Telecom & Payment Services [Member]
Revenue from External Customer [Line Items]
Revenues, Total	7,029	5,029	13,202	9,585
net2phone-UCaaS [Member] | Total net2phone [Member]
Revenue from External Customer [Line Items]
Revenues, Total	6,027	3,233	10,832	5,630
net2phone-Platform Services [Member] | Total net2phone [Member]
Revenue from External Customer [Line Items]
Revenues, Total	$ 5,496	$ 5,066	$ 11,158	$ 10,457