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Stock-based Compensation and Employee Benefit Plans (Details Textual) (USD $)
In Millions, except Share data, unless otherwise specified
12 Months Ended
Dec. 25, 2012
Dec. 27, 2011
Dec. 28, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of common stock available for future grant 15,555    
Number of days vested of the termination of the option holders employment 30 days    
Contributions by the company $ 0.8 $ 0.8 $ 0
POWR [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Accumulated benefit obligation 1.7 0.8 1.1
Rabbi Trust [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Investments held within the rabbi trust   10.4  
Investments held within rabbi trust $ 10.4    
Series 1 Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Price per share of common stock investment $ 100.00    
Percentage of share value accretes at a rate 9.00%    
Series 2 Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Price per share of common stock investment $ 250.00    
2011 Stock option plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Authorized number of shares to be granted 261,469    
Percentage of outstanding shares of common stock of the purchaser 10.00%    
Expired date 10 years    
Number of common stock available for future grant 261,469    
2011 Stock option plan [Member] | Series 1 Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of options granted 80.00%    
Number of years subject to the achievement of certain performance targets 4 years    
2011 Stock option plan [Member] | Series 2 Options [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Percentage of options granted 20.00%    
Percentage of options issued 20.00%