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Income Taxes - Additional Information (Detail)	9 Months Ended
Income Taxes - Additional Information (Detail)	Sep. 29, 2012	Sep. 24, 2011
Income Taxes [Line Items]
Effective income tax rate	37.80%	38.20%

- Definition

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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