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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. 30, 2023 | Sep. 24, 2022 | Sep. 25, 2021
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | $ (12,596) | $ (17,584) | $ (25,776)
Other comprehensive income before reclassifications |  | 1,275 | 2,904 | 5,166
Recognition in earnings of net actuarial loss for pension settlement |  | 0 | 840 | 958
Reclassifications to earnings |  | 654 | 1,244 | 2,068
Other comprehensive income |  | 1,929 | 4,988 | 8,192
Balance ending |  | (10,667) | (12,596) | (17,584)
Pension Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | (17,797) | (23,303) | (32,286)
Funded status benefit plan obligation |  | 680 | 2,199 | 4,736
Recognition in earnings of net actuarial loss for pension settlement | [1] | 0 | 840 | 958
Reclassifications to earnings | [1] | 1,927 | 2,467 | 3,289
Other comprehensive income |  | 2,607 | 5,506 | 8,983
Balance ending |  | (15,190) | (17,797) | (23,303)
Post-Retirement Benefits [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Balance beginning |  | 5,201 | 5,719 | 6,510
Funded status benefit plan obligation |  | 463 | 705 | 430
Prior service credits |  | 132 | 0 | 0
Other comprehensive income |  | (678) | (518) | (791)
Balance ending |  | 4,523 | 5,201 | 5,719
Amortization of Prior Service Credits [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Reclassifications to earnings | [1] | (498) | (498) | (498)
Amortization of Net (Gain) [Member] |  |  |  |
Accumulated Other Comprehensive Income Loss [Line Items] |  |  |  |
Reclassifications to earnings | [1] | $ (775) | $ (725) | $ (723)
[1] | These amounts are included in the computation of net periodic benefit cost. See Note 12, “Employee Benefit Plans.”

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