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Income Taxes (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of July 31	$ 21,322	$ 19,269	$ 20,715
Increases related to current year tax positions	6,588	5,169	2,807
Prior year tax positions:
Prior year increase	800	554	2,694
Prior year decrease	(305)	(2,079)	(3,605)
Cash settlement	(534)	(519)	(1,123)
Lapse of statute of limitations	(334)	(1,072)	(2,219)
Balance at July 31	$ 27,537	$ 21,322	$ 19,269

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