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Employee Benefit Plans - Schedule of Defined Benefit Plans Disclosure (Details) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 27, 2025 | Sep. 28, 2024 | Sep. 30, 2023
Pension Benefits [Member] |  |  |  |  |
Reconciliation of benefit obligations: |  |  |  |  |
Benefit obligation at beginning of year | $ 65,405 |  | $ 69,372 |  |
Interest cost | 2,577 |  | 3,129 |  | $ 3,306
Actuarial (gain) loss | (1,888) |  | 2,012 |  |
Lump sum benefits paid | (3,441) |  | (3,917) |  | (2,639)
Ordinary benefits paid | (4,882) |  | (5,191) |  |
Prior Service Credit | 0 |  | 0 |  |
Benefit obligation at end of year | 57,771 |  | 65,405 |  | 69,372
Reconciliation of fair value of plan assets: |  |  |  |  |
Fair value of plan assets at beginning of year | 52,758 | [1],[2] | 51,340 |  |
Actual return on plan assets | (260) |  | 6,526 |  |
Employer contributions | 4,000 |  | 4,000 |  | 4,000
Lump sum benefits paid | (3,441) |  | (3,917) |  |
Ordinary benefits paid | (4,882) |  | (5,191) |  |
Fair value of plan assets at end of year | 48,175 | [1],[2] | 52,758 | [1],[2] | 51,340
Funded status: |  |  |  |  |
Funded status at end of year | (9,596) |  | (12,647) |  |
Amounts recognized in consolidated balance sheets consist of: |  |  |  |  |
Net amount recognized at end of year | (9,596) |  | (12,647) |  |
Less: current portion | 0 |  | 0 |  |
Noncurrent benefit liability | (9,596) |  | (12,647) |  |
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss): |  |  |  |  |
Actuarial net (loss) gain | (8,697) |  | (9,809) |  |
Prior service credits | 0 |  | 0 |  |
Net amount recognized in accumulated other comprehensive (loss) income | (8,697) |  | (9,809) |  |
Retiree Health and Life Benefits [Member] |  |  |  |  |
Reconciliation of benefit obligations: |  |  |  |  |
Benefit obligation at beginning of year | 2,528 |  | 2,871 |  |
Interest cost | 100 |  | 143 |  | 166
Actuarial (gain) loss | (278) |  | (164) |  |
Lump sum benefits paid | 0 |  | 0 |  |
Ordinary benefits paid | (277) |  | (322) |  |
Prior Service Credit | 14 |  | 0 |  |
Benefit obligation at end of year | 2,087 |  | 2,528 |  | 2,871
Reconciliation of fair value of plan assets: |  |  |  |  |
Fair value of plan assets at beginning of year | 0 |  | 0 |  |
Actual return on plan assets | 0 |  | 0 |  |
Employer contributions | 277 |  | 322 |  |
Lump sum benefits paid | 0 |  | 0 |  |
Ordinary benefits paid | (277) |  | (322) |  |
Fair value of plan assets at end of year | 0 |  | 0 |  | $ 0
Funded status: |  |  |  |  |
Funded status at end of year | (2,087) |  | (2,528) |  |
Amounts recognized in consolidated balance sheets consist of: |  |  |  |  |
Net amount recognized at end of year | (2,087) |  | (2,528) |  |
Less: current portion | 289 |  | 342 |  |
Noncurrent benefit liability | (1,798) |  | (2,186) |  |
Amounts not yet recognized in net periodic benefit cost and included in accumulated other comprehensive income (loss): |  |  |  |  |
Actuarial net (loss) gain | 3,148 |  | 3,556 |  |
Prior service credits | 66 |  | 106 |  |
Net amount recognized in accumulated other comprehensive (loss) income | $ 3,214 |  | $ 3,662 |  |
[1] | Includes funds which are not publicly traded and are valued at the net asset value of the units provided by the fund issuer.
[2] | Includes funds which invest primarily in publicly traded and non-publicly traded, investment grade corporate bonds, U.S. government bonds and asset-backed securities.

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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 -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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