Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2018	Jan. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 395,883	$ 367,556	$ 789,438	$ 736,707
Income (loss) from operations	(480)	3,128	(397)	8,314
Severance	195		635
Other operating expense	(846)	(889)	(1,625)	(1,088)
Operating Segments [Member] | Telecom Platform Services [Member]
Segment Reporting Information [Line Items]
Revenues	387,065	359,924	772,129	721,435
Income (loss) from operations	4,589	7,187	9,150	13,732
Severance	195		605
Other operating expense
Operating Segments [Member] | net2phone-UCaaS [Member]
Segment Reporting Information [Line Items]
Revenues	8,299	7,142	16,087	14,278
Income (loss) from operations	(790)	(464)	(1,464)	(639)
Severance
Other operating expense
Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Revenues	519	490	1,222	994
Income (loss) from operations	(1,019)	82	(1,650)	172
Severance
Other operating expense
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Revenues
Income (loss) from operations	(3,260)	(3,677)	(6,433)	(4,951)
Severance			30
Other operating expense	$ (846)	$ (889)	$ (1,625)	$ (1,088)