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LONG-TERM DEBT (Details) (USD $)
 12 Months Ended
Feb. 28, 2014
Feb. 28, 2013
Long-term debt    
Total long-term debt $ 192,607,000 $ 175,000,000
Less current maturities of long-term debt (96,900,000) (20,000,000)
Long-term debt, excluding current maturities 95,707,000 155,000,000
Unsecured state industrial development loan
    
Long-term debt    
Interim draws 37,610,000  
Interest rate (as a percent) 1.16%  
Total long-term debt 37,607,000  
Unsecured state industrial development loan | Base Rate
    
Long-term debt    
Variable Rate Basis Base rate  
Unsecured state industrial development loan | Base Rate | Maximum
    
Long-term debt    
Basis spread on variable rate (as percent) 1.125%  
Unsecured state industrial development loan | LIBOR
    
Long-term debt    
Variable Rate Basis LIBOR  
Unsecured state industrial development loan | LIBOR | Maximum
    
Long-term debt    
Basis spread on variable rate (as percent) 2.125%  
Unsecured floating interest rate 10 year Senior Notes
    
Long-term debt    
Face amount 75,000,000  
Interest rate (as a percent) 6.01%  
Debt instrument term 10 years  
Variable Rate Basis three-month LIBOR  
Basis spread on variable rate (as percent) 0.90%  
Total long-term debt 75,000,000 75,000,000
3.90% unsecured Senior Notes payable
    
Long-term debt    
Face amount 100,000,000  
Interest rate (as a percent) 3.90%  
Interest rate (as a percent) 3.90%  
Principal payments 20,000,000  
Frequency of principal payment Annual  
Total long-term debt $ 80,000,000 $ 100,000,000