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Income Taxes - Reconciliation of Effective Income Tax Rate to Federal Rate (Detail)
12 Months Ended
Jan. 01, 2018
Oct. 03, 2020
Sep. 28, 2019
Sep. 29, 2018
Income Tax Disclosure [Abstract]        
Federal income tax rate 35.00% 21.00% 21.00% 24.50%
State taxes, net of federal benefit   3.40% 2.20% 1.90%
Foreign Derived Income   0.00% (1.10%) 0.00%
Domestic production activity deduction   0.00% 0.00% (1.40%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses, Percent   (41.10%) 0.00% 0.00%
Earnings in jurisdictions taxed at rates different from the statutory U.S. federal rate   (13.20%) 0.10% (1.10%)
Tax Act   4.40% (0.30%) (11.50%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent   (14.60%) 0.10% 0.40%
Other, including tax reserves and related interest   0.00% (0.30%) (1.50%)
Effective Income Tax Rate, Continuing Operations, Total   (40.10%) 21.70% 11.30%