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Income Taxes - Effective Income Tax Rate Reconciliation (Details)
12 Months Ended
Sep. 29, 2023
Sep. 30, 2022
Oct. 01, 2021
Income Tax Disclosure [Abstract]      
United States statutory income tax rate 21.00% 21.00% 21.00%
Increase (decrease) in taxes, resulting from:      
State income taxes, net of Federal tax benefit 2.40% 4.70% 7.70%
Foreign taxes 1.10% 4.00% 6.10%
Reduction of foreign valuation allowances (0.40%) (2.10%) (16.50%)
Permanent book/tax differences (0.40%) 2.40% (0.40%)
Uncertain tax positions 0.70% 1.00% (2.20%)
Reduction of foreign tax credit valuation allowance (0.60%) (0.30%) (27.50%)
Sale of investments (1.60%) 0.00% 0.00%
CARES Act - Carryback rate differential 0.00% 0.00% 37.90%
Canada Defined Benefit Pension Plan Termination 0.00% 0.00% 3.00%
Pennsylvania Rate Change Impact 0.00% (1.70%) 0.00%
Tax credits & other (1.30%) (5.00%) 1.50%
Effective income tax rate 20.90% 24.00% 30.60%