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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jul. 02, 2011	Jul. 03, 2010	Dec. 31, 2010
Income Taxes [Line Items]
Income tax rate	30.40%	33.60%
Total gross liability for unrecognized tax benefits	$ 24.8	$ 27.9	$ 24.3

- 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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