Retirement Plans, Plan Asset Allocations (Details) - Defined Benefit Pension Plans [Member] - USD ($) $ in Millions	Sep. 28, 2019	Sep. 29, 2018
Retirement Plans [Abstract]
Actual plan asset allocation	100.00%	100.00%
Equity Securities and Equity-Like Instruments [Member]
Retirement Plans [Abstract]
Actual plan asset allocation	50.00%	50.00%
Company Common Stock [Member]
Retirement Plans [Abstract]
Company stock held in plan assets	$ 35
Debt Securities and Debt-Like [Member]
Retirement Plans [Abstract]
Actual plan asset allocation	33.00%	45.00%
International Insurance Policies [Member]
Retirement Plans [Abstract]
Actual plan asset allocation	6.00%	0.00%
Other [Member]
Retirement Plans [Abstract]
Actual plan asset allocation	11.00%	5.00%