Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Feb. 28, 2014	Feb. 28, 2013	Feb. 29, 2012
Schedule of Accumulated Other Comprehensive Loss [Line Items]
Balance	$ (59,808)	$ (62,459)	$ (25,057)
Other comprehensive income before reclassifications	6,497	(5,971)	(45,314)
Amounts reclassified from accumulated other comprehensive loss	7,040	8,622	7,912
Other comprehensive income (loss)	13,537	2,651	(37,402)
Balance	(46,271)	(59,808)	(62,459)
Net Unrecognized Actuarial Losses [Member]
Schedule of Accumulated Other Comprehensive Loss [Line Items]
Balance	(49,479)	(39,774)	(17,528)
Other comprehensive income before reclassifications	9,713	(10,456)	(22,591)
Amounts reclassified from accumulated other comprehensive loss	1,051	751	345
Other comprehensive income (loss)	10,764	(9,705)	(22,246)
Balance	(38,715)	(49,479)	(39,774)
Net Unrecognized Hedge Losses [Member]
Schedule of Accumulated Other Comprehensive Loss [Line Items]
Balance	(10,329)	(22,685)	(7,529)
Other comprehensive income before reclassifications	(3,216)	4,485	(22,723)
Amounts reclassified from accumulated other comprehensive loss	5,989	7,871	7,567
Other comprehensive income (loss)	2,773	12,356	(15,156)
Balance	$ (7,556)	$ (10,329)	$ (22,685)