Income Taxes (Reconciliation of the Federal Statutory Income Tax Rate to Effective Tax Rate) (Details)	12 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income tax expense at federal statutory rate	21.00%	21.00%	24.50%
State income taxes, net of federal tax benefit	5.30%	5.30%	4.70%
One-time, non-cash impact of the Tax Cuts and Jobs Act	0.00%	0.00%	17.50%
Stock compensation excess tax benefit	(0.40%)	(0.10%)	(1.10%)
Benefit of jobs tax credits, net of valuation allowance	(0.50%)	(0.30%)	(0.40%)
Release of federal tax liability	0.00%	(0.60%)	0.00%
Adjustment to state tax provision	0.00%	(0.90%)	0.00%
Benefit related to COLIs	(0.90%)	(1.00%)	(0.40%)
Termination of interest rate swaps	0.00%	(2.60%)	0.00%
Officers’ compensation limitation	2.20%	1.10%	0.40%
Other, net	0.10%	(1.10%)	(1.30%)
Effective tax rate	26.80%	20.80%	43.90%