Net Earnings Per Share (Schedule Of Information Necessary To Calculate Basic And Diluted Net Earnings Per Common Share) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Apr. 30, 2012		Apr. 30, 2011		Apr. 30, 2012		Apr. 30, 2011
Net Earnings Per Share [Abstract]
Weighted average shares - basic	150,536,631	[1]	154,651,222	[1]	150,385,389	[1]	154,716,918	[1]
Common share equivalents	2,670,000	[1]	2,757,000	[1]	2,682,000	[1]	2,808,000	[1]
Weighted average shares - diluted	153,207,471	[1]	157,408,094	[1]	153,067,148	[1]	157,524,628	[1]
Net earnings for basic and diluted earnings per share computation	$ 70,946		$ 61,811		$ 193,320		$ 159,524
Net earnings per share - basic	$ 0.47	[1]	$ 0.40	[1]	$ 1.29	[1]	$ 1.03	[1]
Net earnings per share - diluted	$ 0.46	[1]	$ 0.39	[1]	$ 1.26	[1]	$ 1.01	[1]

[1] Current and prior year shares and per share amounts reflect the impact of the Company's two-for-one stock split that occurred March 23, 2012.