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Postretirement Plans - Summary of Fair Value by Asset Category and Level Within Fair Value Hierarchy (Detail) - USD ($) $ in Millions | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | $ 1,305.0 | $ 1,110.8 | $ 1,049.2
Voluntary Employees Beneficiary Association Plan Assets [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 13.4 | 13.2 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Investments Measured at NAV [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 7.7 | 7.2 |
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 | 0.2 | 0.7 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 5.5 | 5.3 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Equity securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3.8 | 3.6 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Equity securities [Member] | Investments Measured at NAV [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3.8 | 3.6 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Hedge Funds [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3.9 | 3.6 |
Voluntary Employees Beneficiary Association Plan Assets [Member] | Hedge Funds [Member] | Investments Measured at NAV [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Fair Value of Plan Assets | 3.9 | 3.6 |
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 | 5.7 | 6.0 |
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 | 0.2 | 0.7 |
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 | $ 5.5 | $ 5.3 |

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