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Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Aug. 31, 2017
Aug. 31, 2016
Aug. 31, 2017
Aug. 31, 2016
Schedule of Accumulated Other Comprehensive Loss [Line Items]        
Beginning balance     $ (56,555)  
Other comprehensive loss before reclassifications     (4,813)  
Amounts reclassified from accumulated other comprehensive loss     1,741  
Other comprehensive (loss) income, net of taxes $ (1,398) $ 243 (3,072) $ 3,614
Ending balance (59,627)   (59,627)  
Net Unrecognized Actuarial Losses        
Schedule of Accumulated Other Comprehensive Loss [Line Items]        
Beginning balance     (55,521)  
Other comprehensive loss before reclassifications     0  
Amounts reclassified from accumulated other comprehensive loss     549  
Other comprehensive (loss) income, net of taxes     549  
Ending balance (54,972)   (54,972)  
Net Unrecognized Hedge Losses        
Schedule of Accumulated Other Comprehensive Loss [Line Items]        
Beginning balance     (1,034)  
Other comprehensive loss before reclassifications     (4,813)  
Amounts reclassified from accumulated other comprehensive loss     1,192  
Other comprehensive (loss) income, net of taxes     (3,621)  
Ending balance $ (4,655)   $ (4,655)