Other Income (Expense), Net (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Other Income and Expenses [Abstract]
Foreign currency transaction (losses) gains		$ (696)	$ (2,107)	$ 287
(Loss) gain on marketable securities			(16)	323
Gain (loss) on investments	$ 1,100	1,779	(6)	355
Other		(401)	781	(148)
TOTAL		$ 682	$ (1,348)	$ 817