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Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Sep. 27, 2019
Sep. 28, 2018
Sep. 29, 2017
Income Tax Disclosure [Abstract]      
United States statutory income tax rate 21.00% 24.50% 35.00%
Increase (decrease) in taxes, resulting from:      
State income taxes, net of Federal tax benefit 4.20% 3.20% 2.30%
Foreign taxes(1) 2.20% 3.30% (4.30%)
Permanent book/tax differences 0.40% (1.20%) (3.80%)
Uncertain tax positions 0.00% (0.30%) 1.40%
U.S. Tax Reform - Remeasurement of deferred taxes 0.00% (49.30%) 0.00%
U.S. Tax Reform - Foreign tax credit valuation allowance (2.30%) 2.80% 0.00%
Effective Income Tax Rate Reconciliation, Disposition of Business, Percent (4.40%) 0.00% 0.00%
Tax credits & other (1.70%) (3.50%) (2.50%)
Effective income tax rate 19.40% (20.50%) 28.10%