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Business Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Segment Reporting Information [Line Items]        
Revenues $ 321,336 $ 341,255 $ 985,425 $ 1,053,044
Income (loss) from operations 3,792 449 3,722 174
Other operating expense, net (234) (2,420) (3,402) (5,805)
Operating Segments [Member] | Telecom & Payment Services [Member]        
Segment Reporting Information [Line Items]        
Revenues 308,790 328,838 947,342 1,018,637
Income (loss) from operations 9,934 4,245 21,441 12,605
Other operating expense, net (2,300) (2,150) (5,185)
Operating Segments [Member] | net2phone [Member]        
Segment Reporting Information [Line Items]        
Revenues 12,546 12,417 38,083 34,407
Income (loss) from operations (3,932) (1,266) (10,512) (4,663)
Other operating expense, net (386) (983) 25
Operating Segments [Member] | Corporate [Member]        
Segment Reporting Information [Line Items]        
Revenues
Income (loss) from operations (2,210) (2,530) (7,207) (7,768)
Other operating expense, net $ 152 $ (120) $ (269) $ (645)