Revenue Recognition - Summary of contract liabilities activity (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019
Contract Liabilities
Beginning Balance	$ 28,235	$ 29,015
Revenue deferred in current year	58,221	61,996
Deferred revenue recognized	(60,229)	(61,913)
Foreign currency translation	293	(863)
Ending Balance	26,520	$ 28,235
Contract liabilities included in Other long-term liabilities	(297)
Deferred revenue	$ 26,223