Net Earnings Per Share (Basic And Dilutive Net Earnings Per Share Reconciliations) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended			6 Months Ended
	Aug. 31, 2012	Aug. 31, 2011		Aug. 31, 2012	Aug. 31, 2011
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Net earnings	$ 111,636	$ 111,154	[1],[2]	$ 232,382	$ 236,654	[1],[2]
Less net earnings allocable to restricted stock	0	0	[2]	0	190	[2]
Net earnings available for basic common shares	111,636	111,154	[2]	232,382	236,464	[2]
Adjustment for dilutive potential common shares	0	0	[2]	0	24	[2]
Net earnings available for diluted common shares	$ 111,636	$ 111,154	[2]	$ 232,382	$ 236,488	[2]
Weighted average common shares outstanding	228,366	226,300	[1],[2]	228,069	225,935	[1],[2]
Weighted average common shares and dilutive potential common shares	231,696	230,681	[1],[2]	231,749	230,479	[1],[2]
Basic net earnings per share	$ 0.49	$ 0.49	[1],[2]	$ 1.02	$ 1.05	[1],[2]
Diluted net earnings per share	$ 0.48	$ 0.48	[1],[2]	$ 1.00	$ 1.03	[1],[2]
Stock Options [Member]
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares	2,958	3,575	[2]	3,196	3,764	[2]
Stock-Settled Restricted Stock Units [Member]
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares	372	806	[2]	484	780	[2]

[1] As discussed in Note 2, fiscal 2012 reflects the revisions to correct our accounting for sale-leaseback transactions.

[2] (1) As discussed in Note 2, fiscal 2012 reflects the revisions to correct our accounting for sale-leaseback transactions.