Pensions and Other Post-employment Benefits (Detail 1) - USD ($) $ in Thousands	6 Months Ended
Jun. 29, 2018	Jun. 30, 2017
Other Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer Contribution	$ 13,000	$ 4,000

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