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Income Taxes (Details) (Detail)	3 Months Ended		9 Months Ended
Income Taxes (Details) (Detail)	Sep. 29, 2012	Sep. 24, 2011	Sep. 29, 2012	Sep. 24, 2011
Effective tax rate (benefit)	6.40%	21.70%	5.10%	8.90%

- 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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