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Tax Matters - Narrative (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Oct. 02, 2011	Sep. 30, 2012	Oct. 02, 2011
Income Tax Examination [Line Items]
Effective tax rate for income from continuing operations	(4.00%)	34.30%	19.00%	31.20%
Loss Contingency, Settlement Agreement, Consideration		$ 491.0		$ 491.0
Internal Revenue Service (IRS) [Member]
Income Tax Examination [Line Items]
Tax Adjustments, Settlements, and Unusual Provisions	(1,100)

- 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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