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								12 Months Ended
	Feb. 29, 2020	Nov. 30, 2019	Aug. 31, 2019	May 31, 2019	Feb. 28, 2019	Nov. 30, 2018	Aug. 31, 2018	May 31, 2018	Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2018
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Net earnings	$ 214,934	$ 173,156	$ 233,599	$ 266,744	$ 192,556	$ 190,311	$ 220,890	$ 238,656	$ 888,433	$ 842,413	$ 664,112
Weighted average common shares outstanding (in shares)									164,836	174,463	182,660
Weighted average common shares and dilutive potential common shares (in shares)									166,820	175,884	184,470
Basic net earnings per share (in dollars per share)	$ 1.32	$ 1.05	$ 1.41	$ 1.60	$ 1.14	$ 1.09	$ 1.25	$ 1.34	$ 5.39	$ 4.83	$ 3.64
Diluted net earnings per share (in dollars per share)	$ 1.30	$ 1.04	$ 1.40	$ 1.59	$ 1.13	$ 1.09	$ 1.24	$ 1.33	$ 5.33	$ 4.79	$ 3.60
Stock Options
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares (in shares)									1,580	1,028	1,390
Stock-Settled Market Stock Units
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Dilutive potential common shares (in shares)									404	393	420