Stock Ownership Plans - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 24, 2023	Sep. 25, 2022	Sep. 26, 2021
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Non-cash stock compensation expense	$ 1.8	$ 1.3	$ 0.9
Common stock reserved for future issuances (in shares)	196,359
Number of shares available for grant (in shares)	196,359
Unrecognized compensation expense for unvested restricted common stock	$ 1.7
Cost not yet recognized, period for recognition (years)	1 year 4 months 24 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