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Commitments and Contingencies - Narratve (Detail) $ in Millions	12 Months Ended
	Dec. 29, 2018 USD ($) Employees	Dec. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Commitments And Contingencies [Line Items]
Rent expense, net of sub-lease rental income | $	$ 33.0	$ 35.2	$ 31.2
Collective bargaining agreements expiration	5 years
Accrued legal charges | $	$ 30.9	$ 45.9
Benefit recorded related to settlement | $	$ 4.3
Workforce Subject to Collective Bargaining Arrangements
Commitments And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements	2,650
Percentage of employees covered under collective bargaining agreements	21.00%
Workforce Subject to Collective Bargaining Agreements Expiring in 2019
Commitments And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements	875
Workforce Subject to Collective Bargaining Arrangements Expiring in 2020
Commitments And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements	975
Workforce Subject to Collective Bargaining Arrangements Expiring in 2021
Commitments And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements	575
Workforce Subject to Collective Bargaining Arrangements Expiring in 2022
Commitments And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements	175
Workforce Subject to Collective Bargaining Arrangements Expiring in 2023
Commitments And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements	50

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Commitments and contingencies [Line Items]

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Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Carrying amount of reserve for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs, which is expected to be paid within one year of the date of the statement of financial position.

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