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Revolving Credit Facilities (Detail Textuals) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
U.S. | Revolving credit facility
    
Line of Credit Facility [Line Items]    
U.S. revolving credit facility maximum available credit less the uncommitted accordion feature $ 400 $ 400
Uncommitted accordion amount 100.0 100.0
U.S. revolving credit facility maximum available credit 500  
Future maximum available credit for the future amended line of credit 522.5  
Additional maximum available credit for the future amended line of credit 22.5  
Future maximum available credit for the future amended line of credit 422.5  
Maturity period for future amended line of credit 3 years  
Outstanding lines of credit 169.5 93.4
Revolving credit facility excess availability 86.0 115.7
Interest rate on revolving credit facility 4.10% 4.20%
Date of the final maturity of revolving credit facility Jan. 07, 2014  
U.S. | Letters of credit
    
Line of Credit Facility [Line Items]    
Uncommitted accordion amount 1.5  
Other letters of credit 1.5  
Outstanding letters of credit 4.5 2.7
Canada | Revolving credit facility
    
Line of Credit Facility [Line Items]    
Outstanding lines of credit 1.9 1.1
Revolving credit facility excess availability $ 2.0 $ 2.6
Interest rate on revolving credit facility 4.00% 4.00%
Date of the final maturity of revolving credit facility Aug. 14, 2014