v2.4.0.6
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, 2011
Nov. 30, 2010
Nov. 30, 2011
Nov. 30, 2010
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]        
Net earnings $ 82,794 $ 82,364 $ 320,977 $ 291,368
Less net earnings allocable to restricted stock 0 330 160 1,282
Net earnings available for basic common shares 82,794 82,034 320,817 290,086
Adjustment for dilutive potential common shares 0 9 0 0
Net earnings available for diluted common shares $ 82,794 $ 82,043 $ 320,817 $ 290,086
Weighted average common shares outstanding 226,446 223,953 226,104 223,007
Weighted average common shares and dilutive potential common shares 230,632 228,471 230,529 226,924
Basic net earnings per share $ 0.37 $ 0.37 $ 1.42 $ 1.30
Diluted net earnings per share $ 0.36 $ 0.36 $ 1.39 $ 1.28
Stock Options [Member]
       
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]        
Dilutive potential common shares 3,337 3,867 3,622 3,346
Stock-Settled Restricted Stock Units [Member]
       
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]        
Dilutive potential common shares 849 651 803 571