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Income Taxes (Reconciliation of the Federal Statutory Income Tax Rate to Effective Tax Rate) (Details) | 12 Months Ended
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Sep. 29, 2019 | Sep. 30, 2018 | Oct. 01, 2017
Income Tax Disclosure [Abstract] |  |  |
Income tax expense at federal statutory rate | 21.00% | 24.50% | 35.00%
State income taxes, net of federal tax benefit | 5.30% | 4.70% | 3.80%
One-time, non-cash impact of the Tax Act | 0.00% | 17.50% | 0.00%
Stock compensation excess tax benefit | (0.10%) | (1.10%) | 0.00%
Benefit of jobs tax credits, net of valuation allowance | (0.30%) | (0.40%) | (0.40%)
Release of federal tax liability | (0.60%) | 0.00% | 0.00%
Adjustment to state tax provision | (0.90%) | 0.00% | 0.00%
Benefit related to COLIs | (1.00%) | (0.40%) | (1.10%)
Termination of interest rate swaps | (2.60%) | 0.00% | 0.00%
Other, net | 0.00% | (0.90%) | (0.40%)
Effective tax rate | 20.80% | 43.90% | 36.90%

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