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Stock Ownership Plans - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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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 |  |

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