Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Consolidated Statements Of Comprehensive Income [Abstract]
Net earnings	$ 492,586	$ 434,284	$ 413,795
Retirement plans:
Net change in retirement benefit plan unrecognized actuarial losses	10,764	(9,705)	(22,246)
Cash flow hedges:
Net change in cash flow hedge unrecognized losses	2,773	12,356	(15,156)
Other comprehensive income (loss), net of taxes	13,537	2,651	(37,402)
TOTAL COMPREHENSIVE INCOME	$ 506,123	$ 436,935	$ 376,393