Equity Based Compensation (Summary Of Information Concerning Outstanding And Exercisable Options) (Details) - $ / shares	12 Months Ended
	Jul. 31, 2017	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2014
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding (in shares)	6,685,551	6,822,390	7,191,442	7,197,882
Weighted Average Remaining Contractual Life (Years)	5 years 7 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 32.60
Number Exercisable (in shares)	4,905,026
Weighted Average Exercise Price (in dollars per share)	$ 31.00
$0.00 to $22.69
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options, exercise price range, lower range limit (in dollars per share)	0.00
Share options, exercise price range, upper range limit (in dollars per share)	$ 22.69
Number Outstanding (in shares)	1,209,231
Weighted Average Remaining Contractual Life (Years)	1 year 11 months 1 day
Weighted Average Exercise Price (in dollars per share)	$ 19.63
Number Exercisable (in shares)	1,209,231
Weighted Average Exercise Price (in dollars per share)	$ 19.63
$22.70 to $28.69
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options, exercise price range, lower range limit (in dollars per share)	22.70
Share options, exercise price range, upper range limit (in dollars per share)	$ 28.69
Number Outstanding (in shares)	981,995
Weighted Average Remaining Contractual Life (Years)	7 years 6 months 26 days
Weighted Average Exercise Price (in dollars per share)	$ 27.54
Number Exercisable (in shares)	387,755
Weighted Average Exercise Price (in dollars per share)	$ 26.72
$28.70 to $34.69
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options, exercise price range, lower range limit (in dollars per share)	28.70
Share options, exercise price range, upper range limit (in dollars per share)	$ 34.69
Number Outstanding (in shares)	1,457,982
Weighted Average Remaining Contractual Life (Years)	4 years 4 months 24 days
Weighted Average Exercise Price (in dollars per share)	$ 31.61
Number Exercisable (in shares)	1,440,251
Weighted Average Exercise Price (in dollars per share)	$ 31.61
$34.70 to $40.69
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options, exercise price range, lower range limit (in dollars per share)	34.70
Share options, exercise price range, upper range limit (in dollars per share)	$ 40.69
Number Outstanding (in shares)	1,447,048
Weighted Average Remaining Contractual Life (Years)	6 years 1 month 21 days
Weighted Average Exercise Price (in dollars per share)	$ 37.03
Number Exercisable (in shares)	1,161,545
Weighted Average Exercise Price (in dollars per share)	$ 36.66
$40.70 and above
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Stock options, exercise price range, lower range limit (in dollars per share)	$ 40.70
Number Outstanding (in shares)	1,589,295
Weighted Average Remaining Contractual Life (Years)	8 years 7 days
Weighted Average Exercise Price (in dollars per share)	$ 42.47
Number Exercisable (in shares)	706,244
Weighted Average Exercise Price (in dollars per share)	$ 42.24