Leases - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
Sep. 24, 2022	Sep. 25, 2021	Sep. 26, 2020
Leases [Abstract]
Net rental expense	$ 2.4
Net rental expense		$ 2.3	$ 2.0

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 https://asc.fasb.org/extlink&oid=123391704&loc=SL77918638-209977

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