Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 29, 2020	Feb. 28, 2019	Feb. 28, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	$ (68,010)	$ (54,312)	$ (56,555)
Other comprehensive loss before reclassifications	(86,885)	(10,162)	9,835
Amounts reclassified from accumulated other comprehensive loss	4,824	(3,536)	2,988
Other comprehensive (loss) income	(82,061)	(13,698)	12,823
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			10,580
Balance at end of year	(150,071)	(68,010)	(54,312)
Net Unrecognized Actuarial Losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	(70,478)	(68,497)	(55,521)
Other comprehensive loss before reclassifications	(52,254)	(3,459)	(2,546)
Amounts reclassified from accumulated other comprehensive loss	1,430	1,478	1,175
Other comprehensive (loss) income	(50,824)	(1,981)	(1,371)
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			11,605
Balance at end of year	(121,302)	(70,478)	(68,497)
Net Unrecognized Hedge Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	2,468	14,185	(1,034)
Other comprehensive loss before reclassifications	(34,631)	(6,703)	12,381
Amounts reclassified from accumulated other comprehensive loss	3,394	(5,014)	1,813
Other comprehensive (loss) income	(31,237)	(11,717)	14,194
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			(1,025)
Balance at end of year	(28,769)	2,468	14,185
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive (loss) income	$ (82,061)	$ (13,698)	12,823
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification			$ (10,580)