Stock-Based Compensation Service-Based Stock Options (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Service-Based Stock Options [Abstract]
Employee Service Share-based Compensation, Tax Benefit from Exercise of Stock Options	$ 93	$ 2,541
Fair value of options vested	$ 2,371	$ 2,537
Options Outstanding at July 31, 2020	1,273,382
Options, Grants in Period	303,052
Options, Grants in Period, Weighted Average Exercise Price	$ 39.92	$ 54.05
Options, Exercised in Period	(22,300)
Options, Exercises in Period, Weighted Average Exercise Price	$ 29.10
Options Forfeited in Period, Number of Shares	0
Options, Forfeitures and Expirations in Period, Weighted Average Exercise Price	$ 0
Options Outstanding, Weighted Average Exercise Price	$ 37.84
Options, Outstanding, Intrinsic Value	$ 5,410
Options Outstanding, Weighted Average Remaining Contractual Term	7 years 2 months 12 days
Options Outstanding at October 31, 2020	1,554,134
Options Outstanding, Weighted Average Exercise Price	$ 38.37
Options Exercisable	1,004,641
Options Exercisable, Weighted Average Exercise Price	$ 34.88
Options Exercisable, Weighted Average Remaining Contractual Term	6 years 1 month 6 days
Options, Exercises in Period, Intrinsic Value	$ 373	$ 10,225
Options, Exercisable, Intrinsic Value	$ 5,410