Other Operating Expense, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Other Operating Expense [Abstract]
Corporate—Straight Path Communications Inc. class action legal fees	$ 260	$ 195
net2phone—indemnification claim	365
Telecom & Payment Services-accrual for non-income related taxes related to a foreign subsidiary	2,150	1,100
Total other operating expense, net	$ (2,775)	$ (1,295)