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Benefit Plans - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 29, 2012
Dec. 31, 2011
Jan. 01, 2011
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Projected benefit obligations $ 41.8 $ 39.3  
Weighted average return of both plans 5.70%    
Expected contribution to pension plans during 2013 2.0    
Total expenses with respect to plans $ 6.9 $ 6.4 $ 3.9
Equity Securities [Member] | U.K. Plan [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Plan assets, target allocation percentage in securities 65.00%    
Equity Securities [Member] | U.S. Plan [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Plan assets, target allocation percentage in securities 50.00%    
Debt Securities [Member] | U.K. Plan [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Plan assets, target allocation percentage in securities 35.00%    
Debt Securities [Member] | U.S. Plan [Member]
     
Pension Plans, Postretirement and Other Employee Benefits [Line Items]      
Plan assets, target allocation percentage in securities 50.00%