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Net Earnings Per Share (Basic And Dilutive Net Earnings Per Share Reconciliations) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Nov. 30, 2016
Nov. 30, 2015
Nov. 30, 2016
Nov. 30, 2015
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]        
Net earnings $ 136,645 $ 128,199 $ 474,367 $ 482,401
Weighted average common shares outstanding, shares 189,200 201,291 191,431 205,760
Weighted average common shares and dilutive potential common shares, shares 190,818 203,383 193,239 208,242
Basic net earnings per share (in dollars per share) $ 0.72 $ 0.64 $ 2.48 $ 2.34
Diluted net earnings per share (in dollars per share) $ 0.72 $ 0.63 $ 2.45 $ 2.32
Stock options        
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]        
Dilutive potential common shares, shares 1,191 1,552 1,346 1,853
Stock-settled stock units and awards        
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]        
Dilutive potential common shares, shares 427 540 462 629