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Other Operating Expense, Net (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Other Operating Expense [Abstract]        
Corporate-Straight Path Communications Inc. class action legal fees net of insurance proceeds $ 152 $ (120) $ (269) $ (645)
net2phone-indemnification claim and other, net (386) (920)
net2phone-other, net (63) 25
Telecom & Payment Services-accrual for non-income related taxes related to a foreign subsidiary (2,300) (2,150) (5,400)
Telecom & Payment Services-gain on sale of calling card business in Asia 215
Total other operating expense, net $ (234) $ (2,420) $ (3,402) $ (5,805)