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Subsequent Event (Details) (Revolving credit facility, USD $)
In Millions, unless otherwise specified
 0 Months Ended 3 Months Ended
Apr. 24, 2013
Mar. 30, 2013
Subsequent Events    
Revolving credit facility, maximum capacity   $ 60.0
Amounts issued and outstanding under letters of credit   0.4
Subsequent event
    
Subsequent Events    
Revolving credit facility, maximum capacity 125.0  
Borrowings under revolving line of credit 15.0 15.0
Amounts issued and outstanding under letters of credit $ 0.4  
Subsequent event | Minimum
    
Subsequent Events    
Commitment fee payable on the unused portion of the credit facility (as a percent) 0.25%  
Subsequent event | Maximum
    
Subsequent Events    
Commitment fee payable on the unused portion of the credit facility (as a percent) 0.375%  
Subsequent event | Adjusted base rate
    
Subsequent Events    
Variable rate basis adjusted base rate  
Subsequent event | Adjusted base rate | Minimum
    
Subsequent Events    
Interest margin (as a percent) 0.50%  
Subsequent event | Adjusted base rate | Maximum
    
Subsequent Events    
Interest margin (as a percent) 1.50%  
Subsequent event | Adjusted eurocurrency rate
    
Subsequent Events    
Variable rate basis adjusted eurocurrency rate  
Subsequent event | Adjusted eurocurrency rate | Minimum
    
Subsequent Events    
Interest margin (as a percent) 1.50%  
Subsequent event | Adjusted eurocurrency rate | Maximum
    
Subsequent Events    
Interest margin (as a percent) 2.50%