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Income Tax Expense (Details)
3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 29, 2013
Income Tax Expense    
Effective income tax rate (as a percent) 30.10% 25.20%
U.S. federal statutory income tax rate (as a percent) 35.00% 35.00%
Effective income tax rate having favorable impact resulting from the retroactive reinstatement and extension of the Federal Research and Development Tax Credit (as a percent)   5.00%