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Income Tax Expense (Details)	3 Months Ended	9 Months Ended
Income Tax Expense (Details)	Sep. 28, 2013	Sep. 28, 2013
Income Tax Expense
Effective income tax rate (as a percent)	32.40%	27.50%
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)		4.00%

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems.

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