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Debt - Schedule (Details) - USD ($)
9 Months Ended
Mar. 01, 2015
Nov. 30, 2015
Nov. 30, 2014
Feb. 28, 2015
Long-term debt        
Long-term Debt.   $ 474,707,000   $ 433,207,000
Less current maturities of long-term debt   (23,800,000)   (21,900,000)
Long-term debt, excluding current maturities   450,907,000   411,307,000
Principal payment made   1,900,000 $ 76,900,000  
Unsecured state industrial development loan        
Long-term debt        
Long-term Debt.   33,807,000   35,707,000
Principal payment made $ 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 | Base Rate Loan        
Long-term debt        
Face amount   $ 37,610,000    
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    
Long-term Debt.   60,000,000   60,000,000
Credit Agreement        
Long-term debt        
Long-term Debt.   $ 380,900,000   $ 337,500,000