Lease Commitments - Narrative (Details) $ in Thousands	12 Months Ended
Dec. 26, 2020 USD ($) renewal	Dec. 28, 2019 USD ($)	Dec. 29, 2018 USD ($)
Leases [Abstract]
Number of renewal options \| renewal	1
Operating lease, rent expense	$ 10,410	$ 10,142
Operating lease, rent expense			$ 9,600

Amount of operating lease expense. Excludes sublease income.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977

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