Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Segment Reporting Information [Line Items]
Revenues	$ 323,890	$ 349,473	$ 664,089	$ 711,789
Income (loss) from operations	1,323	(457)	(70)	(275)
Other operating expense, net	(392)	(2,090)	(3,168)	(3,385)
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues	323,890	349,473	664,089	711,789
Income (loss) from operations	1,323	(457)	(70)	(275)
Other operating expense, net	(392)	(2,090)	(3,168)	(3,385)
Operating Segments [Member] | Telecom & Payment Services [Member]
Segment Reporting Information [Line Items]
Revenues	310,980	337,950	638,552	689,799
Income (loss) from operations	7,135	4,191	11,506	8,360
Other operating expense, net		(1,785)	(2,150)	(2,885)
Operating Segments [Member] | net2phone [Member]
Segment Reporting Information [Line Items]
Revenues	12,910	11,523	25,537	21,990
Income (loss) from operations	(3,317)	(1,897)	(6,580)	(3,397)
Other operating expense, net	(232)	25	(597)	25
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Revenues
Income (loss) from operations	(2,495)	(2,751)	(4,996)	(5,238)
Other operating expense, net	$ (160)	$ (330)	$ (421)	$ (525)