Debt - Interest Rate Swaps (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 30, 2018
Interest rate swap \| Other current and long-term assets
Debt and Credit Arrangements
Derivatives designated as hedging instruments, fair value	$ 396	$ 4,905

Fair value of all asset derivatives designated as cash flow hedging instruments.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959

Name:	us-gaap_CashFlowHedgeDerivativeInstrumentAssetsAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant