Organization and Summary of Significant Accounting Policies - Disaggregation of Revenue - Narrative (Details) - USD ($) $ in Millions	Dec. 27, 2020	Dec. 29, 2019
Unbilled
Disaggregation of Revenue [Line Items]
Accounts receivable	$ 1.2	$ 4.7

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

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