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LONG-TERM DEBT - Schedule (Details) - USD ($)
12 Months Ended
Mar. 01, 2015
Mar. 01, 2014
Feb. 29, 2016
Feb. 28, 2015
Feb. 28, 2014
Long-term debt          
Total long-term debt     $ 623,907,000 $ 433,207,000  
Less current maturities of long-term debt     (23,800,000) (21,900,000)  
Long-term debt, excluding current maturities     600,107,000 411,307,000  
Principal payment made     21,900,000 96,900,000 $ 20,000,000
Unsecured state industrial development loan          
Long-term debt          
Face amount     37,610,000    
Total long-term debt     33,807,000 35,707,000  
Principal payment made $ 1,900,000 $ 1,900,000      
Outstanding principal payable on March 1, 2016     3,800,000    
Outstanding principal payable on March 1, 2017     5,700,000    
Outstanding principal payable on March 1, 2018     1,900,000    
Outstanding principal payable on March 1, 2019     1,900,000    
Outstanding principal payable on March 1, 2020     1,900,000    
Outstanding principal payable on March 1, 2021     1,900,000    
Outstanding principal payable on March 1, 2022     1,900,000    
Outstanding principal payable on March 1, 2023     $ 14,810,000    
Unsecured state industrial development loan | Maximum | Base Rate          
Long-term debt          
Margin (as a percent)     1.00%    
Unsecured state industrial development loan | Maximum | LIBOR          
Long-term debt          
Margin (as a percent)     2.00%    
3.90% unsecured Senior Notes payable          
Long-term debt          
Face amount     $ 100,000,000    
Interest rate (as a percent)     3.90%    
Fixed interest rate (as a percentage)     3.90%    
Principal payment     $ 20,000,000    
Total long-term debt     40,000,000 60,000,000  
Credit Agreement          
Long-term debt          
Maximum revolving commitment     650,000,000    
Debt acquisition costs       4,590,000  
Amount outstanding     1,500,000    
Amount available for borrowings     98,400,000    
Total long-term debt     $ 550,100,000 $ 337,500,000