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
May 31, 2014
May 31, 2013
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]    
Net earnings $ 169,653 $ 146,651
Weighted average common shares outstanding 220,268 224,618
Weighted average common shares and dilutive potential common shares 223,632 228,552
Basic net earnings per share $ 0.77 $ 0.65
Diluted net earnings per share $ 0.76 $ 0.64
Stock Options [Member]
   
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]    
Dilutive potential common shares 2,772 3,194
Stock-Settled Restricted Stock Units [Member]
   
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]    
Dilutive potential common shares 592 740