Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2022	Feb. 28, 2021	Feb. 29, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	$ (118,691)	$ (150,071)	$ (68,010)
Other comprehensive income (loss) before reclassifications	57,245	13,113	(86,885)
Amounts reclassified from accumulated other comprehensive loss	15,024	18,267	4,824
Other comprehensive loss	72,269	31,380	(82,061)
Balance at end of year	(46,422)	(118,691)	(150,071)
Net Unrecognized Actuarial Losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	(92,662)	(121,302)	(70,478)
Other comprehensive income (loss) before reclassifications	17,034	25,729	(52,254)
Amounts reclassified from accumulated other comprehensive loss	2,627	2,911	1,430
Other comprehensive loss	19,661	28,640	(50,824)
Balance at end of year	(73,001)	(92,662)	(121,302)
Net Unrecognized Hedge Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	(26,029)	(28,769)	2,468
Other comprehensive income (loss) before reclassifications	40,211	(12,616)	(34,631)
Amounts reclassified from accumulated other comprehensive loss	12,397	15,356	3,394
Other comprehensive loss	52,608	2,740	(31,237)
Balance at end of year	26,579	(26,029)	(28,769)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss	$ 72,269	$ 31,380	$ (82,061)