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Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Oct. 02, 2020
Sep. 27, 2019
Sep. 28, 2018
Income Tax Disclosure [Abstract]      
United States statutory income tax rate 21.00% 21.00% 24.50%
Increase (decrease) in taxes, resulting from:      
State income taxes, net of Federal tax benefit 3.00% 4.20% 3.20%
Foreign taxes (3.90%) 2.20% 3.30%
Foreign goodwill impairment (5.00%) 0.00% 0.00%
Permanent book/tax differences (0.70%) 0.60% (1.20%)
Uncertain tax positions 0.10% 0.00% (0.30%)
U.S. Tax Reform - Remeasurement of deferred taxes 0.00% 0.00% (49.30%)
U.S. Tax Reform - Foreign tax credit valuation allowance 0.00% (2.30%) 2.80%
Stock compensation 3.60% (0.20%) 0.00%
CARES Act - Carryback rate differential 9.80% 0.00% 0.00%
Sale of HCT 0.00% (4.40%) 0.00%
Tax credits & other 0.90% (1.70%) (3.50%)
Effective income tax rate 28.80% 19.40% (20.50%)
Foreign valuation allowance, percent (3.40%)