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Quarterly Data (Parenthetical) (Detail) (USD $)	3 Months Ended			12 Months Ended
	Apr. 01, 2012	Jun. 26, 2011	Mar. 27, 2011	Dec. 31, 2012
Schedule Of Quarterly Financial Information [Line Items]
Environmental costs		$ 400,000	$ 100,000
Increase (decrease) of diluted earnings per share		$ 10,000
Goodwill Impairment Charges	332,100,000			332,128,000
Net Of Tax
Schedule Of Quarterly Financial Information [Line Items]
Goodwill Impairment Charges	$ 315,100,000

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The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

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