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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.”