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Postretirement Plans - Summary of Amounts Included in Accumulated Other Comprehensive Income on Accompanying Consolidated Balance Sheets (Detail) (USD $) In Millions, unless otherwise specified | Dec. 28, 2013 | Dec. 29, 2012
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Defined Benefit Plan Disclosure [Line Items] |  |
Net gain (loss), net of tax | $ (175.4) | $ (260.4)
U.S. Postretirement Health Care Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Net gain (loss), net of tax | $ 4.2 | $ 0.8

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- Definition Pension and other postretirement benefit plans, accumulated other comprehensive income (loss), net gains (losses), net of tax + References No definition available. + Details
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Period Type: | instant

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- Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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