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Income Taxes (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2011
Dec. 30, 2011
Income Taxes [Line Items]          
Effective income tax rate 19.00% 9.00% 18.00% 12.00%  
Unrecognized tax benefit liabilities include interest and penalties $ 3.0   $ 3.0   $ 2.7
Statutory federal income tax rate     35.00% 35.00%  
Unrecognized tax benefits that would impact effective tax rate $ 32.8   $ 32.8   $ 28.7