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Income Taxes - Reconciliation of Effective Income Tax Rate to Federal Rate (Detail)
12 Months Ended
Jan. 01, 2018
Sep. 28, 2019
Sep. 29, 2018
Sep. 30, 2017
Income Tax Disclosure [Abstract]        
Federal income tax rate 35.00% 21.00% 24.50% 35.00%
State taxes, net of federal benefit   2.20% 1.90% 1.70%
Effective Income Tax Rate Reconciliation, Foreign Derived Intangible Income   (1.10%) 0.00% 0.00%
Domestic production activity deduction   0.00% (1.40%) (2.10%)
Earnings in jurisdictions taxed at rates different from the statutory U.S. federal rate   0.10% (1.10%) (1.60%)
Tax Act [1]   (0.30%) (11.50%) 0.00%
Other, including tax reserves and related interest   (0.20%) (1.10%) (0.90%)
Effective Income Tax Rate, Continuing Operations, Total   21.70% 11.30% 32.10%
[1]
Reflects the impact from the Deferred Remeasurement, net of the Deemed Repatriation Tax