Retirement Plans (Fair Value of Plan Assets of Pension Plans) (Details) - USD ($) $ in Thousands	Oct. 03, 2021	Sep. 27, 2020	Sep. 29, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 409,708	$ 365,510
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	75,225	78,971	$ 79,893
Accumulated benefit obligation	75,225	78,971
Fair value of plan assets	0	0	0
Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	410,053	412,573	521,931
Accumulated benefit obligation	410,053	412,573
Fair value of plan assets	$ 409,708	$ 365,510	$ 476,194