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	0 Months Ended	3 Months Ended					6 Months Ended
	Jan. 27, 2012	Jan. 31, 2013		Apr. 30, 2012	Jan. 31, 2012		Jan. 31, 2013		Jan. 31, 2012
Net Earnings Per Share [Abstract]
Weighted average shares - basic		147,951,535			150,105,610		148,531,306		150,309,746
Common share equivalents		2,037,000	[1]		2,720,000	[1]	2,211,000	[1]	2,651,000	[1]
Weighted average shares - diluted		149,988,832			152,825,570		150,742,467		152,961,346
Net earnings for basic and diluted earnings per share computation		$ 50,813			$ 53,821		$ 104,926		$ 122,374
Net earnings per share - basic		$ 0.34	[1]		$ 0.36	[1]	$ 0.71	[1]	$ 0.82	[1]
Net earnings per share - diluted		$ 0.34	[1]		$ 0.35	[1]	$ 0.70	[1]	$ 0.80	[1]
Stock split ratio	2			2

[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.