Retirement Plans (Reconciliation of Changes in Benefit Obligations, Plan Assets and Funded Status of Retirement Plans) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2022	Oct. 03, 2021	Sep. 27, 2020
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	$ 409,708
Fair value at end of year	303,951	$ 409,708
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Net actuarial gain	(24,249)	(44,134)	$ 4,875
Total recognized in OCI	(27,487)	(49,065)	(39,741)
SERP
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	75,225	78,971
Interest cost	2,173	2,169	2,499
Participant contributions	0	0
Actuarial (gain) loss	(14,830)	(672)
Benefits paid	(5,677)	(5,243)
Other	0	0
Obligation at end of year	56,891	75,225	78,971
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	0	0
Actual (loss) return on plan assets	0	0
Participant contributions	0	0
Employer contributions	5,677	5,243
Benefits paid	(5,677)	(5,243)
Other	0	0
Fair value at end of year	0	0	0
Funded (unfunded) status at end of year	(56,891)	(75,225)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	0	0
Current liabilities	(5,213)	(5,216)
Noncurrent liabilities	(51,678)	(70,009)
Total asset (liability) recognized	(56,891)	(75,225)
Unamortized actuarial loss (gain), net	15,979	32,475
Unamortized prior service cost	34	53
Total	16,013	32,528
Net actuarial gain	(14,830)	(672)
Amortization of actuarial (loss) gain	(1,666)	(1,743)
Amortization of prior service cost	(19)	(19)
Total recognized in OCI	(16,515)	(2,434)
Net periodic benefit (credit) cost	3,858	3,931	4,236
Total recognized in comprehensive income	(12,657)	1,497
Net actuarial loss (gain)	718
Prior service cost	19
Total	737
Postretirement Health Plans
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	17,162	20,965
Interest cost	489	563	807
Participant contributions	92	112
Actuarial (gain) loss	(4,062)	(3,525)
Benefits paid	(1,204)	(1,044)
Other	100	91
Obligation at end of year	12,577	17,162	20,965
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	0	0
Actual (loss) return on plan assets	0	0
Participant contributions	92	112
Employer contributions	1,012	841
Benefits paid	(1,204)	(1,044)
Other	100	91
Fair value at end of year	0	0	0
Funded (unfunded) status at end of year	(12,577)	(17,162)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	0	0
Current liabilities	(1,081)	(1,115)
Noncurrent liabilities	(11,496)	(16,047)
Total asset (liability) recognized	(12,577)	(17,162)
Unamortized actuarial loss (gain), net	(10,781)	(7,359)
Unamortized prior service cost	0	0
Total	(10,781)	(7,359)
Net actuarial gain	(4,062)	(3,526)
Amortization of actuarial (loss) gain	640	341
Amortization of prior service cost	0	0
Total recognized in OCI	(3,422)	(3,185)
Net periodic benefit (credit) cost	(151)	222	825
Total recognized in comprehensive income	(3,573)	(2,963)
Net actuarial loss (gain)	(932)
Prior service cost	0
Total	(932)
Qualified Plan
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Obligation at beginning of year	410,053	412,573
Interest cost	12,506	12,558	13,377
Participant contributions	0	0
Actuarial (gain) loss	(114,999)	(785)
Benefits paid	(14,218)	(14,293)
Other	0	0
Obligation at end of year	293,342	410,053	412,573
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value at beginning of year	409,708	365,510
Actual (loss) return on plan assets	(91,539)	58,491
Participant contributions	0	0
Employer contributions	0	0
Benefits paid	(14,218)	(14,293)
Other	0	0
Fair value at end of year	303,951	409,708	365,510
Funded (unfunded) status at end of year	10,609	(345)
Defined Benefit Plan, Amounts for Asset (Liability) Recognized in Statement of Financial Position [Abstract]
Noncurrent assets	10,609	0
Current liabilities	0	0
Noncurrent liabilities	0	(345)
Total asset (liability) recognized	10,609	(345)
Unamortized actuarial loss (gain), net	101,372	108,922
Unamortized prior service cost	0	0
Total	101,372	108,922
Net actuarial gain	(5,357)	(39,936)
Amortization of actuarial (loss) gain	(2,193)	(3,510)
Amortization of prior service cost	0	0
Total recognized in OCI	(7,550)	(43,446)
Net periodic benefit (credit) cost	(3,404)	(3,272)	$ 36,661
Total recognized in comprehensive income	(10,954)	$ (46,718)
Net actuarial loss (gain)	2,349
Prior service cost	0
Total	$ 2,349