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Stock Ownership Plans - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 25, 2022	Sep. 26, 2021	Sep. 27, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Non-cash stock compensation expense	$ 1,337	$ 854	$ 1,042
Common stock reserved for future issuances (in shares)	279,810
Number of shares available for grant (in shares)	279,810
Unrecognized compensation expense for unvested restricted common stock	$ 1,876
Cost not yet recognized, period for recognition (years)	1 year 3 months 18 days
Employee Stock Purchase Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee stock ownership plan, shares available for issuance (in shares)	27,000
Supplemental Employee Stock Purchase Plan
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Employee stock ownership plan, shares available for issuance (in shares)	870
Options
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Vesting or restriction period (in years)	10 years