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LONG-TERM DEBT (Details) (USD $)
 12 Months Ended
Feb. 29, 2012
Feb. 28, 2011
Feb. 28, 2010
Long-term debt      
Total long-term debt $ 178,000,000 $ 231,000,000  
Less current maturities of long-term debt (3,000,000) (53,000,000)  
Long-term debt, excluding current maturities 175,000,000 178,000,000  
Limit on additional debt borrowings 254,400,000    
INTEREST EXPENSE      
Interest and commitment fees 7,670,000 3,268,000 3,468,000
Deferred finance costs 823,000 428,000 332,000
Interest rate swap settlements, net 4,424,000 5,997,000 6,510,000
Total interest expense 12,917,000 9,693,000 10,310,000
Write off of unamortized deferred finance fees associated with the termination of a prior credit agreement   92,000  
Fixed rate Senior Notes
      
Long-term debt      
Fixed rate debt 103,000,000    
Fixed rate Senior Notes | Fair Value, Level 2
      
Long-term debt      
Fixed rate debt 104,450,000    
7.24% unsecured senior note payable
      
Long-term debt      
Face amount 15,000,000    
Interest rate (as a percent) 7.24%    
Principal payments 3,000,000    
Frequency of principal payment Annual    
Total long-term debt 3,000,000 6,000,000  
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  
Unsecured floating interest rate 7 year Senior Notes
      
Long-term debt      
Face amount 50,000,000    
Interest rate (as a percent) 5.89%    
Debt instrument term (in years) 7    
Variable Rate Basis three-month LIBOR    
Basis spread on variable rate (as percent) 0.85%    
Total long-term debt   50,000,000  
Unsecured floating interest rate 10 year Senior Notes
      
Long-term debt      
Face amount 75,000,000    
Interest rate (as a percent) 6.01%    
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