Other Income (Expense), Net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018
Schedule of other (expense) income, net
Foreign currency transaction gains (losses)	$ 370	$ 169	$ (835)	$ (559)
(Loss) gain on sale of debt securities		(16)		(9)
Gain on investments	128	179	81	59
Other	(2)	38	(99)	53
Total other income (expense), net	$ 496	$ 370	$ (853)	$ (456)