Revenue Recognition - Summary of contract liabilities activity (Details) - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2019	Jul. 31, 2018
Contract Liabilities
Beginning Balance	$ 29,015
Revenue deferred in current year	48,589
Deferred revenue recognized	(49,710)
Foreign currency translation	(435)
Ending Balance	27,459
Contract liabilities included in Other long-term liabilities	(824)
Deferred revenue	$ 26,635	$ 28,614