Stock Compensation Plan (Schedule Of Share Based Compensation Option And SARs Award Activity) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Awards, outstanding beginning balance (in shares)	1,324	2,290	2,381
Awards, granted (in shares)	80	86	143
Awards, exercised (in shares)	(219)	(1,049)	(215)
Awards, forfeited or expired (in shares)	(14)	(3)	(19)
Awards, outstanding ending balance (in shares)	1,171	1,324	2,290
Awards, exercisable ending balance (in shares)	1,003
Weighted-average exercise price, outstanding beginning balance (in dollars per share)	$ 91.01	$ 59.12	$ 52.98
Weighted-average exercise price, granted (in dollars per share)	293.82	237.86	174.42
Weighted-average exercise price, exercised (in dollars per share)	49.09	33.25	60.05
Weighted-average exercise price, forfeited or expired (in dollars per share)	217.58	172.03	108.06
Weighted-average exercise price, outstanding ending balance (in dollars per share)	111.12	$ 91.01	$ 59.12
Weighted-average exercise price, exercisable ending balance (in dollars per share)	$ 87.92
Weighted-average remaining contractual term, outstanding ending balance (in years)	4 years 11 months
Weighted-average remaining contractual term, exercisable ending balance (in years)	4 years 5 months
Aggregate intrinsic value, outstanding ending balance	$ 162,835
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Exercisable, Number	1,160
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price	$ 109.93
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Remaining Contractual Term	4 years 11 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 162,604
Aggregate intrinsic value, exercisable ending balance	$ 159,244