Income Taxes (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2020	Jul. 31, 2019	Jul. 31, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of July 31	$ 27,537	$ 21,322	$ 19,269
Increases related to current year tax positions	8,196	6,588	5,169
Prior year tax positions:
Prior year increase	6,390	800	554
Prior year decrease	(1,603)	(305)	(2,079)
Cash settlement	(1,182)	(534)	(519)
Lapse of statute of limitations	(3,215)	(334)	(1,072)
Balance at July 31	$ 36,123	$ 27,537	$ 21,322