Stock Option Plans (Outstanding And Exercisable Options) (Details) (USD $)	12 Months Ended
	Jul. 31, 2014	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number Outstanding	7,197,882	7,329,820	8,056,327	8,387,994
Weighted Average Remaining Contractual Life (Years)	5 years 5 months 9 days
Weighted Average Exercise Price	$ 26.84
Number Exercisable	5,477,819
Weighted Average Exercise Price	$ 23.31
Range Of Exercise Prices $0.00 To $16.69 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range	$ 0.00
Range of Exercise Prices, upper range	$ 16.69
Number Outstanding	1,003,381
Weighted Average Remaining Contractual Life (Years)	1 year 2 months 5 days
Weighted Average Exercise Price	$ 15.93
Number Exercisable	1,003,381
Weighted Average Exercise Price	$ 15.93
Range Of Exercise Prices $16.70 To $22.69 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range	$ 16.70
Range of Exercise Prices, upper range	$ 22.69
Number Outstanding	2,197,543
Weighted Average Remaining Contractual Life (Years)	4 years 1 month 13 days
Weighted Average Exercise Price	$ 19.13
Number Exercisable	2,197,543
Weighted Average Exercise Price	$ 19.13
Range Of Exercise Prices $22.70 To $28.69 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range	$ 22.70
Range of Exercise Prices, upper range	$ 28.69
Number Outstanding	400,114
Weighted Average Remaining Contractual Life (Years)	3 years 4 months 28 days
Weighted Average Exercise Price	$ 22.97
Number Exercisable	400,114
Weighted Average Exercise Price	$ 22.97
Range Of Exercise Prices $28.70 To $34.69 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range	$ 28.70
Range of Exercise Prices, upper range	$ 34.69
Number Outstanding	1,839,809
Weighted Average Remaining Contractual Life (Years)	7 years 3 months
Weighted Average Exercise Price	$ 31.58
Number Exercisable	1,254,101
Weighted Average Exercise Price	$ 30.59
Range Of Exercise Prices $34.70 And Above [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Range of Exercise Prices, lower range	$ 34.70
Number Outstanding	1,757,035
Weighted Average Remaining Contractual Life (Years)	8 years 1 month 6 days
Weighted Average Exercise Price	$ 38.64
Number Exercisable	622,680
Weighted Average Exercise Price	$ 35.52