Quarterly report pursuant to Section 13 or 15(d)

Income Taxes - Additional information (Detail)

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Income Taxes - Additional information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 30, 2013
Mar. 31, 2012
Income Taxes [Line Items]    
Effective income tax rate 20.10% 26.70%
Net discrete tax Benefits $ 13.5  
Tax benefit related to retroactive extension of tax credits 8.3  
Realization of unrecognized tax benefits 5.6  
Tax reduction due to discrete items 4.00%  
Decrease in unrecognized tax benefits and associated interest primarily due to the audit settlements 2.3  
Net unrecognized tax benefits and interest, if recognized, would reduce the annual effective tax rate 119.4  
Reduction in income tax expenses 41.4  
Possible decrease in unrecognized income tax benefits $ 12.5