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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 |  |

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669646-108580 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan, that has not been recognized in net periodic benefit (cost) credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=124509347&loc=SL7669686-108580 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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