Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Aug. 31, 2021	May 31, 2021	Aug. 31, 2020	May 31, 2020	Aug. 31, 2021	Aug. 31, 2020
Schedule of Accumulated Other Comprehensive Loss [Line Items]
Beginning balance		$ (118,691)			$ (118,691)
Other comprehensive loss before reclassifications					(1,968)
Amounts reclassified from accumulated other comprehensive loss					8,316
Other comprehensive income (loss), net of taxes	$ 3,411	2,937	$ 4,979	$ (15,334)	6,348	$ (10,355)
Ending balance	(112,343)				(112,343)
Net Unrecognized Actuarial Losses
Schedule of Accumulated Other Comprehensive Loss [Line Items]
Beginning balance		(92,662)			(92,662)
Other comprehensive loss before reclassifications					0
Amounts reclassified from accumulated other comprehensive loss					1,317
Other comprehensive income (loss), net of taxes					1,317
Ending balance	(91,345)				(91,345)
Net Unrecognized Hedge Gains (Losses)
Schedule of Accumulated Other Comprehensive Loss [Line Items]
Beginning balance		$ (26,029)			(26,029)
Other comprehensive loss before reclassifications					(1,968)
Amounts reclassified from accumulated other comprehensive loss					6,999
Other comprehensive income (loss), net of taxes					5,031
Ending balance	$ (20,998)				$ (20,998)