Business Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Segment Reporting Information [Line Items]
Revenues	$ 362,316	$ 393,555
Income (loss) from operations	1,282	83
Severance		439
Other operating expense	(195)	(779)
Operating Segments [Member] | Telecom & Payment Services [Member]
Segment Reporting Information [Line Items]
Revenues	351,849	385,082
Income (loss) from operations	5,269	4,423
Severance		409
Other operating expense
Operating Segments [Member] | net2phone [Member]
Segment Reporting Information [Line Items]
Revenues	10,467	7,788
Income (loss) from operations	(1,500)	(674)
Severance
Other operating expense
Operating Segments [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Revenues		685
Income (loss) from operations		(547)
Severance
Other operating expense
Operating Segments [Member] | Corporate [Member]
Segment Reporting Information [Line Items]
Revenues
Income (loss) from operations	(2,487)	(3,119)
Severance		30
Other operating expense	$ (195)	$ (779)