Stock-Based Compensation (Summary Of Information Concerning Outstanding And Exercisable Options) (Details) - $ / shares	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017	Jul. 31, 2016
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding (in shares)	6,531,250	6,785,812	6,685,551	6,822,390
Weighted average remaining contractual life (in years)	5 years 7 months 6 days
Weighted average exercise price (in dollars per share)	$ 39.66
Number exercisable (in shares)	4,819,812
Weighted average exercise price (in dollars per share)	$ 35.48
$16.91 to $32.49
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding (in shares)	1,493,111
Weighted average remaining contractual life (in years)	3 years 10 months 24 days
Weighted average exercise price (in dollars per share)	$ 27.46
Number exercisable (in shares)	1,493,111
Weighted average exercise price (in dollars per share)	$ 27.46
Stock options, exercise price range, lower range limit (in dollars per share)	16.91
Share options, exercise price range, upper range limit (in dollars per share)	$ 32.49
$32.50 to $37.49
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding (in shares)	1,211,064
Weighted average remaining contractual life (in years)	3 years
Weighted average exercise price (in dollars per share)	$ 34.41
Number exercisable (in shares)	1,211,064
Weighted average exercise price (in dollars per share)	$ 34.41
Stock options, exercise price range, lower range limit (in dollars per share)	32.5
Share options, exercise price range, upper range limit (in dollars per share)	$ 37.49
$37.50 to $42.49
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding (in shares)	1,283,417
Weighted average remaining contractual life (in years)	5 years 2 months 12 days
Weighted average exercise price (in dollars per share)	$ 40.30
Number exercisable (in shares)	1,239,817
Weighted average exercise price (in dollars per share)	$ 40.23
Stock options, exercise price range, lower range limit (in dollars per share)	37.5
Share options, exercise price range, upper range limit (in dollars per share)	$ 42.49
$42.50 to $47.49
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding (in shares)	1,653,643
Weighted average remaining contractual life (in years)	7 years 7 months 6 days
Weighted average exercise price (in dollars per share)	$ 44.00
Number exercisable (in shares)	840,920
Weighted average exercise price (in dollars per share)	$ 43.56
Stock options, exercise price range, lower range limit (in dollars per share)	42.5
Share options, exercise price range, upper range limit (in dollars per share)	$ 47.49
$47.50 and above
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number outstanding (in shares)	890,015
Weighted average remaining contractual life (in years)	9 years
Weighted average exercise price (in dollars per share)	$ 58.27
Number exercisable (in shares)	34,900
Weighted average exercise price (in dollars per share)	$ 52.08
Stock options, exercise price range, lower range limit (in dollars per share)	$ 47.5