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Income Taxes - Reconciliation of Effective Income Tax Rate to Federal Rate (Detail)
12 Months Ended
Sep. 29, 2018
Sep. 30, 2017
Oct. 01, 2016
Income Tax Disclosure [Abstract]      
Federal income tax rate 24.50% 35.00% 35.00%
State taxes, net of federal benefit 1.90% 1.70% 1.80%
Domestic production activity deduction (1.40%) (2.10%) (1.60%)
Earnings in jurisdictions taxed at rates different from the statutory U.S. federal rate (1.10%) (1.60%) (1.10%)
Tax Act (11.50%) [1] 0.00% 0.00%
Other, including tax reserves and related interest (1.10%) (0.90%) 0.10%
Effective Income Tax Rate, Continuing Operations, Total 11.30% 32.10% 34.20%
[1] Reflects the impact from the Deferred Remeasurement, net of the Deemed Repatriation Tax