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Income Taxes (Reasons For Differences Between Statutory Federal Tax Rate And Effective Income Tax Rate) (Details)
12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Income Tax Disclosure [Abstract]      
Federal income tax rate 35.00% 35.00% 35.00%
State income taxes 2.30% 2.70% 3.10%
Unrecognized tax benefits, net (0.10%) (1.70%) (1.80%)
Domestic production deduction (3.10%) (2.60%) (3.70%)
Foreign rate differences and valuation allowances 0.30% 0.00% 3.80%
Other (2.10%) (1.60%) (0.10%)
Effective income tax rate 32.30% 31.80% 36.30%