Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Sep. 29, 2019
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 2,169	$ 2,499	$ 3,080
Actuarial loss	1,743	1,652	1,207
Amortization of unrecognized prior service cost	19	85	115
Net periodic benefit (credit) cost	3,931	4,236	4,402
Postretirement Health Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	563	807	997
Actuarial loss	(341)	18	(159)
Net periodic benefit (credit) cost	222	825	838
Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	12,558	13,377	19,825
Expected return on plan assets	(19,340)	(19,578)	(26,334)
Pension settlements	0	39,218	0
Actuarial loss	3,510	3,644	2,754
Net periodic benefit (credit) cost	$ (3,272)	$ 36,661	$ (3,755)