Stock-Based Compensation Service-Based Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Oct. 31, 2018	Oct. 31, 2017
Service-Based Stock Options [Abstract]
Options Outstanding at July 31, 2016	2,504,633
Options Outstanding at July 31, 2016, Weighted Average Exercise Price	$ 28.23
Options, Grants in Period	276,238
Options, Grants in Period, Weighted Average Exercise Price	$ 43.96	$ 36.85
Options, Exercised in Period	(551,919)
Options, Exercises in Period, Weighted Average Exercise Price	$ 0
Options, Forfeitures or Expirations in Period	(5,407)
Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 36.24
Options Outstanding, Weighted Average Remaining Contractual Term	6 years 6 months
Options Outstanding at October 31, 2016	2,223,545
Options Outstanding at October 31, 2016, Weighted Average Exercise Price	$ 30.50
Options Outstanding, Aggregate Intrinsic Value	$ 23,842
Options Exercisable	1,621,317	2,229,350
Options Exercisable, Weighted Average Exercise Price	$ 27.06	$ 27.39
Options Exercisable, Weighted Average Remaining Contractual Term	5 years 7 months 6 days
Options Exercisable, Aggregate Intrinsic Value	$ 22,340