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Restructuring and Asset Impairments - Restructuring, Asset Impairment and Intangible Asset Impairment Charges (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 29, 2012	Dec. 31, 2011	Jan. 01, 2011
Restructuring And Impairment Costs [Line Items]
Restructuring				$ (0.5)
Asset impairments	0.6		0.6
Intangible asset impairments	1.4		1.4
Restructuring, goodwill impairment and asset impairment charges (gains)			$ 2.0	$ (0.5)

The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value.

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- Definition

Amount charged against earnings in the period for incurred and estimated costs associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding asset retirement obligations.

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