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Accumulated Other Comprehensive Loss (Accumulated Other Comprehensive Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
May 31, 2018
May 31, 2017
Schedule of Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance $ (54,312)  
Other comprehensive loss before reclassifications (285)  
Amounts reclassified from accumulated other comprehensive loss (448)  
Other comprehensive income (loss), net of taxes (733) $ (1,674)
Ending balance (55,045)  
Net Unrecognized Actuarial Losses    
Schedule of Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance (68,497)  
Other comprehensive loss before reclassifications 0  
Amounts reclassified from accumulated other comprehensive loss 369  
Other comprehensive income (loss), net of taxes 369  
Ending balance (68,128)  
Net Unrecognized Hedge Gains (Losses)    
Schedule of Accumulated Other Comprehensive Loss [Line Items]    
Beginning balance 14,185  
Other comprehensive loss before reclassifications (285)  
Amounts reclassified from accumulated other comprehensive loss (817)  
Other comprehensive income (loss), net of taxes (1,102)  
Ending balance $ 13,083