Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Feb. 28, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	$ (46,422)	$ (118,691)	$ (150,071)
Other comprehensive income before reclassifications	162,669	57,245	13,113
Amounts reclassified from accumulated other comprehensive loss	(18,378)	15,024	18,267
Other comprehensive income	144,291	72,269	31,380
Balance at end of year	97,869	(46,422)	(118,691)
Net Unrecognized Actuarial Losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	(73,001)	(92,662)	(121,302)
Other comprehensive income before reclassifications	26,477	17,034	25,729
Amounts reclassified from accumulated other comprehensive loss	1,934	2,627	2,911
Other comprehensive income	28,411	19,661	28,640
Balance at end of year	(44,590)	(73,001)	(92,662)
Net Unrecognized Hedge Gains (Losses)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of year	26,579	(26,029)	(28,769)
Other comprehensive income before reclassifications	136,192	40,211	(12,616)
Amounts reclassified from accumulated other comprehensive loss	(20,312)	12,397	15,356
Other comprehensive income	115,880	52,608	2,740
Balance at end of year	142,459	26,579	(26,029)
AOCI Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income	$ 144,291	$ 72,269	$ 31,380