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Amounts Reclassified Out of Accumulated Other Comprehensive Income - Reclassification out of accumulated other comprehensive (loss) income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 28, 2024 | Sep. 30, 2023 | Sep. 24, 2022
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | $ (10,667) |  |
Other comprehensive income before reclassifications |  | 3,418 | $ 1,275 | $ 2,904
Recognition in earnings of net actuarial loss for pension settlement |  | 638 | 0 | 840
Reclassifications to earnings |  | 464 | 654 | 1,244
Other comprehensive income |  | 4,520 | 1,929 | 4,988
Balance ending |  | (6,147) | (10,667) |
Pension Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | (15,190) | (17,797) | (23,303)
Funded status benefit plan obligation |  | 3,254 | 680 | 2,199
Recognition in earnings of net actuarial loss for pension settlement | [1] | 638 | 0 | 840
Reclassifications to earnings | [1] | 1,489 | 1,927 | 2,467
Other comprehensive income |  | 5,381 | 2,607 | 5,506
Balance ending |  | (9,809) | (15,190) | (17,797)
Post-Retirement Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | 4,523 | 5,201 | 5,719
Funded status benefit plan obligation |  | 164 | 463 | 705
Prior service credits |  | 0 | 132 | 0
Reclassifications to earnings | [1] | (284) | (498) | (498)
Other comprehensive income |  | (861) | (678) | (518)
Balance ending |  | 3,662 | 4,523 | 5,201
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | (10,667) | (12,596) |
Balance ending |  | (6,147) | (10,667) | (12,596)
Amortization of Net (Gain) [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | (10,667) | (12,596) | (17,584)
Reclassifications to earnings | [1] | $ (741) | (775) | (725)
Balance ending |  |  | $ (10,667) | $ (12,596)
[1] | These amounts are included in the computation of net periodic benefit cost. See Note 12, “Employee Benefit Plans.”

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