Pension and Postretirement Benefit Obligations - Additional Information (Detail) - Pension Plans	9 Months Ended
Sep. 27, 2020 USD ($) benefit_plan
Defined Benefit Plan Disclosure [Line Items]
Company contribution to pension plans during the period	$ 16,300,000
Number of company-sponsored pension plans \| benefit_plan	2
Benefit pension plan, expected contributions, remainder of fiscal year	$ 0

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Name:	us-gaap_DefinedBenefitPlanContributionsByEmployer
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration