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Postretirement Plans - Summary of Fair Value by Asset Category and Level Within Fair Value Hierarchy (Detail) (USD $) In Millions, unless otherwise specified | Dec. 28, 2013 | Dec. 29, 2012 | Dec. 31, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 1,015.4 | $ 964.0 | $ 846.1
Voluntary Employees Beneficiary Association Plan Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 15.0 | 15.1 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Cash And Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.1 | 0.1 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Equity securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 8.6 | 8.5 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Hedge funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3.6 | 3.2 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1.9 | 2.1 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Real Estate And Other Real Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.8 | 1.2 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Quoted Prices For Identical Assets (Level 1) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 11.4 | 11.9 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Quoted Prices For Identical Assets (Level 1) [Member] | Cash And Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.1 | 0.1 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Quoted Prices For Identical Assets (Level 1) [Member] | Equity securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 8.6 | 8.5 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Quoted Prices For Identical Assets (Level 1) [Member] | Debt securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 1.9 | 2.1 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Quoted Prices For Identical Assets (Level 1) [Member] | Real Estate And Other Real Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 0.8 | 1.2 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3.6 | 3.2 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Significant Unobservable Inputs (Level 3) [Member] | Hedge funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 3.6 | $ 3.2 |

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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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