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, 2017	Nov. 30, 2016	Nov. 30, 2017	Nov. 30, 2016
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Net earnings	$ 148,840	$ 136,645	$ 541,966	$ 474,367
Weighted average common shares outstanding, shares	181,888	189,200	183,324	191,431
Weighted average common shares and dilutive potential common shares, shares	184,033	190,818	185,201	193,239
Basic net earnings per share (in dollars per share)	$ 0.82	$ 0.72	$ 2.96	$ 2.48
Diluted net earnings per share (in dollars per share)	$ 0.81	$ 0.72	$ 2.93	$ 2.45
Stock options
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares, shares	1,659	1,191	1,444	1,346
Stock-settled stock units and awards
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares, shares	486	427	433	462