Pensions and Other Post-employment Benefits (Detail 1) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 28, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Defined Benefit Plan Disclosure [Line Items]
Pension curtailment	$ 3,296		$ 3,296	$ 0
Pension Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Contributions by Employer			3,000	13,000
Pension curtailment	$ 3,296	$ 0	$ 3,296	$ 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