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
	Oct. 31, 2012		Oct. 31, 2011
Net Earnings Per Share [Abstract]
Weighted average shares - basic	149,149,429	[1]	150,513,892	[1]
Common share equivalents	2,375,000	[2]	2,533,000	[2]
Weighted average shares - diluted	151,524,125	[1]	153,047,198	[1]
Net earnings for basic and diluted earnings per share computation	$ 54,113		$ 68,553
Net earnings per share - basic	$ 0.36	[1]	$ 0.46	[1]
Net earnings per share - diluted	$ 0.36	[1]	$ 0.45	[1]

[1] Prior year shares and per share amounts reflect the impact of the Company's two-for-one stock split that occurred during the third quarter of Fiscal 2012.

[2] Prior year shares and per share amounts reflect the impact of the Company's two-for-one stock split that occurred during the third quarter of Fiscal 2012.