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Debt (Details 2) (USD $)
 3 Months Ended
May 31, 2013
Feb. 28, 2013
Long-term debt    
Total long-term debt $ 186,835,000 $ 175,000,000
Less current maturities of long-term debt (21,900,000) (20,000,000)
Long-term debt, excluding current maturities 164,935,000 155,000,000
Unsecured state industrial development loan
    
Long-term debt    
Face amount 38,000,000  
Interest rate (as a percent) 1.57%  
Total long-term debt 11,835,000  
Period after facility is ready for occupancy for which debt may be prepaid 6 months  
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%  
Principal payments 20,000,000  
Frequency of principal payment Annual  
Total long-term debt $ 100,000,000 $ 100,000,000
Base Rate | Unsecured state industrial development loan
    
Long-term debt    
Variable Rate Basis Base rate  
Base Rate | Unsecured state industrial development loan | Maximum
    
Long-term debt    
Basis spread on variable rate (as percent) 1.125%  
LIBOR | Unsecured state industrial development loan
    
Long-term debt    
Variable Rate Basis LIBOR  
LIBOR | Unsecured state industrial development loan | Maximum
    
Long-term debt    
Basis spread on variable rate (as percent) 2.125%