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Debt (Details) - USD ($)
Aug. 12, 2015
Jan. 30, 2016
Jan. 31, 2015
Debt      
Total debt   $ 5,913,000 $ 6,450,000
Less: current portion   (589,000) (537,000)
Total long-term debt   5,324,000 5,913,000
Base rate      
Debt      
Variable rate basis Base rate    
Base rate | Minimum      
Debt      
Interest rate margin (as a percent) 0.125%    
Base rate | Maximum      
Debt      
Interest rate margin (as a percent) 0.375%    
Adjusted LIBOR rate      
Debt      
Variable rate basis Adjusted LIBOR rate    
Adjusted LIBOR rate | Minimum      
Debt      
Interest rate margin (as a percent) 1.125%    
Adjusted LIBOR rate | Maximum      
Debt      
Interest rate margin (as a percent) 1.375%    
Revolving credit agreement      
Debt      
Total debt   0 0
Term of credit agreement 5 years    
Credit facility borrowing capacity $ 1,000,000,000    
Adjusted availability of borrowing base (as a percent) 7.50%    
Borrowings under credit facility   0 0
Total borrowing capacity   985,969,000 485,969,000
Revolving credit agreement | Maximum      
Debt      
Credit facility borrowing capacity extension $ 250,000,000    
Letters of credit      
Debt      
Letters of credit maximum $ 150,000,000    
Letters of credit outstanding   14,031,000 14,031,000
Capital lease obligation      
Debt      
Total debt   5,565,000 5,994,000
Other debt      
Debt      
Total debt   $ 348,000 $ 456,000