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Postretirement Plans - Summary of Fair Value by Asset Category and Level Within Fair Value Hierarchy (Detail) - Voluntary Employees Beneficiary Association Plan Assets - USD ($) $ in Millions	Dec. 29, 2018	Dec. 30, 2017
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 12.1	$ 13.4
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.3	0.2
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.5	5.5
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.1	3.8
Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	2.2	3.9
Quoted Prices for Identical Assets (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	6.8	5.7
Quoted Prices for Identical Assets (Level 1) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1.3	0.2
Quoted Prices for Identical Assets (Level 1) | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.5	5.5
Quoted Prices for Identical Assets (Level 1) | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Quoted Prices for Identical Assets (Level 1) | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Investments Measured at NAV
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5.3	7.7
Investments Measured at NAV | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Investments Measured at NAV | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0.0	0.0
Investments Measured at NAV | Equity securities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3.1	3.8
Investments Measured at NAV | Hedge funds
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 2.2	$ 3.9

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+ References

No definition available.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(iv)(01)
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