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Commitments and Contingencies (Detail Textuals 1) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 04, 2014
Agreement
Dec. 29, 2012
Dec. 31, 2011
Commitments And Contingencies [Line Items]      
Total rental expense $ 4.8 $ 4.8 $ 4.8
Carrying amount of capital leases related to trucks and trailors 15.4 10.3 5.0
Net book value of capital leases related to trucks and trailors $ 11.1 $ 9.3 $ 4.0
Percentages of employees represented by various labour unions 33.00%    
Number of collective bargaining agreements 36    
Number of collective bargaining agreements up for renewal 5    
Minimum
      
Commitments And Contingencies [Line Items]      
Capital leases maturity period 5 years    
Maximum
      
Commitments And Contingencies [Line Items]      
Capital leases maturity period 6 years