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, 2020	Aug. 31, 2020	May 31, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Nov. 30, 2020	Nov. 30, 2019
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Net earnings	$ 235,300	$ 296,696	$ 4,978	$ 173,156	$ 233,599	$ 266,744	$ 536,974	$ 673,499
Weighted average common shares outstanding, shares	163,732			164,273			163,278	165,321
Weighted average common shares and dilutive potential common shares, shares	165,773			166,534			164,976	167,154
Basic net earnings per share (in dollars per share)	$ 1.44			$ 1.05			$ 3.29	$ 4.07
Diluted net earnings per share (in dollars per share)	$ 1.42			$ 1.04			$ 3.25	$ 4.03
Stock options
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares, shares	1,636			1,820			1,341	1,466
Stock-settled stock units and awards
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares, shares	405			441			357	367