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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 26, 2020 | Sep. 28, 2019 | Sep. 29, 2018
Income Tax Reconciliation [Abstract] |  |  |
Income tax provision at federal statutory tax rate | $ 12,728 | $ 14,593 | $ 15,945
Impact of Partnership income not subject to federal income taxes | (13,045) | (14,925) | (15,939)
Permanent differences | 127 | 162 | 65
Change in valuation allowance | (298) | 115 | (21,307)
State income taxes | 403 | 707 | 656
Remeasurement of net deferred tax assets | 0 | 0 | 19,941
Other | (61) | 205 | 33
Provision for income taxes - current and deferred | $ (146) | $ 857 | $ (606)

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