Accounting For Stock-Based Compensation (Summary Of Information Concerning Outstanding And Exercisable Options) (Details) (USD $)	6 Months Ended			9 Months Ended
	Jan. 31, 2014	Apr. 30, 2014	Jul. 31, 2013	Apr. 30, 2014 Range Of Exercise Prices $0.00 To $16.69 [Member]	Apr. 30, 2014 Range Of Exercise Prices $16.70 To $22.69 [Member]	Apr. 30, 2014 Range Of Exercise Prices $22.70 To $28.69 [Member]	Apr. 30, 2014 Range Of Exercise Prices $28.70 To $34.69 [Member]	Apr. 30, 2014 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				$ 0.00	$ 16.70	$ 22.70	$ 28.70	$ 34.70
Range of Exercise Prices, upper range				$ 16.69	$ 22.69	$ 28.69	$ 34.69
Number Outstanding	7,276,418	7,276,418	7,329,820	1,050,081	2,207,951	405,114	1,854,574	1,758,698
Weighted Average Remaining Contractual Life (Years)	5 years 8 months 1 day			1 year 4 months 28 days	4 years 4 months 13 days	3 years 8 months 1 day	7 years 6 months	8 years 4 months 17 days
Weighted Average Exercise Price	$ 26.76			$ 15.92	$ 19.13	$ 23.01	$ 31.58	$ 38.62
Number Exercisable	5,550,856			1,050,081	2,207,951	405,114	1,266,367	621,343
Weighted Average Exercise Price	$ 23.25			$ 15.92	$ 19.13	$ 23.01	$ 30.59	$ 35.43