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Commitments and Contingencies - Narratve (Detail) $ in Millions	12 Months Ended
	Dec. 28, 2019 USD ($) Employees	Dec. 29, 2018 USD ($)
Commitments And Contingencies [Line Items]
Collective bargaining agreements expiration	5 years
Benefit recorded related to settlement | $	$ 11.6
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 2020
Commitments And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements	1,825
Workforce Subject to Collective Bargaining Arrangements Expiring in 2021
Commitments And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements	650
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	0
Workforce Subject to Collective Bargaining Arrangements Expiring in 2024
Commitments And Contingencies [Line Items]
Number of employees covered under collective bargaining agreements	0
Judgment In Patent Related Litigation Matter
Commitments And Contingencies [Line Items]
Loss contingency accrual | $		$ 30.9

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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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