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		9 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Net earnings	$ 106,452	$ 94,681	$ 393,377	$ 327,063
Weighted average common shares outstanding	223,259	228,904	223,831	228,346
Weighted average common shares and dilutive potential common shares	227,417	232,656	227,870	232,048
Basic net earnings per share	$ 0.48	$ 0.41	$ 1.76	$ 1.43
Diluted net earnings per share	$ 0.47	$ 0.41	$ 1.73	$ 1.41
Stock Options [Member]
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares	3,402	3,210	3,305	3,199
Stock-Settled Restricted Stock Units [Member]
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares	756	542	734	503