Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Segment Reporting Information [Line Items]
Revenues	$ 349,473	$ 395,883	$ 711,789	$ 789,438
Income (loss) from operations	1,543	(480)	2,825	(397)
Severance		195		635
Other operating income (expense), net	(90)	(846)	(285)	(1,625)
Operating Segments [Member] | Telecom & Payment Services [Member]
Segment Reporting Information [Line Items]
Revenues	337,950	387,065	689,799	772,148
Income (loss) from operations	6,191	4,450	11,460	8,873
Severance		195		605
Other operating income (expense), net	215		215
Operating Segments [Member] | net2phone [Member]
Segment Reporting Information [Line Items]
Revenues	11,523	8,299	21,990	16,087
Income (loss) from operations	(1,897)	(790)	(3,397)	(1,464)
Severance
Other operating income (expense), net	25		25
Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Revenues		519		1,203
Income (loss) from operations		(915)		(1,462)
Severance
Other operating income (expense), net
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Revenues
Income (loss) from operations	(2,751)	(3,225)	(5,238)	(6,344)
Severance				30
Other operating income (expense), net	$ (330)	$ (846)	$ (525)	$ (1,625)