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Income Taxes (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance as of August 1	$ 19,269	$ 20,715	$ 17,428
Increases related to current year tax positions	5,169	2,807	4,311
Prior year tax positions:
Prior year increase	554	2,694	1,120
Prior year decrease	(2,079)	(3,605)	0
Cash settlement	(519)	(1,123)	(412)
Lapse of statute of limitations	(1,072)	(2,219)	(1,732)
Balance at July 31	$ 21,322	$ 19,269	$ 20,715

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