Stock-Based Compensation Service-Based Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Oct. 31, 2019	Oct. 31, 2018
Service-Based Stock Options [Abstract]
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 2,541	$ 2,356
Fair value of options vested	$ 2,537	$ 2,798
Options Outstanding at July 31, 2019	1,594,716
Options Outstanding, Weighted Average Exercise Price	$ 31.63
Options, Grants in Period	247,297
Options, Grants in Period, Weighted Average Exercise Price	$ 54.05	$ 43.96
Options, Exercised in Period	(381,698)
Options, Exercises in Period, Weighted Average Exercise Price	$ 27.05
Options Forfeited in Period, Number of Shares	2,221
Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 40.25
Options Outstanding, Weighted Average Remaining Contractual Term	7 years 2 months 12 days
Options Outstanding at October 31, 2019	1,458,094
Options Outstanding, Weighted Average Exercise Price	$ 36.62
Options Outstanding, Aggregate Intrinsic Value	$ 28,976
Options Exercisable	933,905
Options Exercisable, Weighted Average Exercise Price	$ 30.59
Options Exercisable, Weighted Average Remaining Contractual Term	6 years
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value	$ 10,225	$ 9,423
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 24,192