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Summary Of Accounting Policies (Accumulated Other Comprehensive Loss) (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | Dec. 29, 2012 | Dec. 31, 2011
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Accumulated Other Comprehensive Income Loss [Line Items] |  |
Unamortized loss on pension and post-retirement benefit plans, tax | $ 144.1 | $ 157.8

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