Income Taxes (Reconciliation of the Statutory U.S. Federal Income Tax Rate With Our Effective Income Tax Rate) (Details)	12 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Oct. 01, 2017
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent	21.00%	24.50%	35.00%
State income taxes, net of federal tax benefit	2.10%	2.10%	2.80%
Benefits and taxes related to foreign operations	(0.10%)	(0.10%)	(2.80%)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Percent	(2.10%)	(0.90%)	0.00%
Effective Income Tax Rate Reconciliation, Repatriation of Foreign Earnings, Percent	1.70%	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Foreign Derived Intangible Income, Percent	(1.50%)	0.00%	0.00%
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent	(1.30%)	0.00%	0.00%
Domestic production activity deduction	0.00%	0.00%	(1.80%)
Gain resulting from acquisition of joint venture	0.00%	(5.80%)	0.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent	0.00%	2.80%	0.00%
Other, net	(0.30%)	(0.80%)	0.00%
Effective tax rate	19.50%	21.80%	33.20%