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Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Feb. 28, 2021
Feb. 29, 2020
Feb. 28, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year $ (150,071) $ (68,010) $ (54,312)
Other comprehensive loss before reclassifications 13,113 (86,885) (10,162)
Amounts reclassified from accumulated other comprehensive loss 18,267 4,824 (3,536)
Other comprehensive loss 31,380 (82,061) (13,698)
Balance at end of year (118,691) (150,071) (68,010)
Net Unrecognized Actuarial Losses      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year (121,302) (70,478) (68,497)
Other comprehensive loss before reclassifications 25,729 (52,254) (3,459)
Amounts reclassified from accumulated other comprehensive loss 2,911 1,430 1,478
Other comprehensive loss 28,640 (50,824) (1,981)
Balance at end of year (92,662) (121,302) (70,478)
Net Unrecognized Hedge Gains (Losses)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance at beginning of year (28,769) 2,468 14,185
Other comprehensive loss before reclassifications (12,616) (34,631) (6,703)
Amounts reclassified from accumulated other comprehensive loss 15,356 3,394 (5,014)
Other comprehensive loss 2,740 (31,237) (11,717)
Balance at end of year (26,029) (28,769) 2,468
AOCI Attributable to Parent [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive loss $ 31,380 $ (82,061) $ (13,698)