Benefit Plans - Weighted Average Asset Allocations (Details) - Pension Plan	Sep. 28, 2019	Sep. 29, 2018
Defined Benefit Plan Disclosure [Line Items]
Weighted average allocations of plan assets	100.00%	100.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average allocations of plan assets	67.00%	70.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Weighted average allocations of plan assets	33.00%	30.00%