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
6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Income Taxes [Line Items]    
Effective income tax rate 21.00% 21.70%
Net discrete tax Benefits $ 29.5 $ 15.5
Discrete tax expense related to effects of tax rate changes 5.0  
Refund claims related to prior years $ 33.0 4.1
Realization of unrecognized net tax benefits   $ 8.5
Tax reduction due to discrete items 5.10% 2.70%
Change in effective income tax rate without discrete items 1.70%  
Decrease in unrecognized tax benefits and associated interest $ 25.6  
Net unrecognized tax benefits and interest, if recognized, would reduce the annual effective tax rate 81.9  
Possible decrease in unrecognized income tax benefits 29.9  
Reduction in income tax expenses $ 19.8