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, 2019	Aug. 31, 2019	May 31, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Nov. 30, 2019	Nov. 30, 2018
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Net earnings	$ 173,156	$ 233,599	$ 266,744	$ 190,311	$ 220,890	$ 238,656	$ 673,499	$ 649,857
Weighted average common shares outstanding, shares	164,273			173,816			165,321	176,088
Weighted average common shares and dilutive potential common shares, shares	166,534			175,321			167,154	177,656
Basic net earnings per share (in dollars per share)	$ 1.05			$ 1.09			$ 4.07	$ 3.69
Diluted net earnings per share (in dollars per share)	$ 1.04			$ 1.09			$ 4.03	$ 3.66
Stock options
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares, shares	1,820			1,109			1,466	1,165
Stock-settled stock units and awards
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares, shares	441			396			367	403