Fair value of all liability 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=121590274&loc=SL5624163-113959

Name:	us-gaap_CashFlowHedgeDerivativeInstrumentLiabilitiesAtFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Debt - Interest Rate Swaps (Details) - Interest rate swap - Other current and long-term Liabilities - USD ($) $ in Thousands	Sep. 26, 2021	Dec. 27, 2020
Designated as a hedge
Debt and Credit Arrangements
Derivatives, fair value		$ 13,452
Not designated as a hedge
Debt and Credit Arrangements
Derivatives, fair value	$ 8,162