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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		6 Months Ended
	Aug. 31, 2017	Aug. 31, 2016	Aug. 31, 2017	Aug. 31, 2016
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Net earnings	$ 181,424	$ 162,362	$ 393,126	$ 337,722
Weighted average common shares outstanding, shares	182,868	191,539	184,034	192,534
Weighted average common shares and dilutive potential common shares, shares	184,696	193,623	185,778	194,437
Basic net earnings per share (in dollars per share)	$ 0.99	$ 0.85	$ 2.14	$ 1.75
Diluted net earnings per share (in dollars per share)	$ 0.98	$ 0.84	$ 2.12	$ 1.74
Stock options
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares, shares	1,465	1,599	1,337	1,423
Stock-settled stock units and awards
Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]
Dilutive potential common shares, shares	363	485	407	480

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Schedule of Basic and Dilutive Net Earnings Per Share Reconciliation [Line Items]

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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