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Amounts Reclassified Out of Accumulated Other Comprehensive Income - Reclassification Out of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period $ (6,147)  
Other comprehensive (loss) income (116) $ 169
Balance, end of period (6,263)  
Pension Benefits [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period (9,809) (15,190)
Reclassifications to earnings [1] 62 425
Other comprehensive (loss) income 62 425
Balance, end of period (9,747) (14,765)
Postretirement Benefits [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period 3,662 4,523
Amortization of net gain and prior service credits [1] (178) (256)
Other comprehensive (loss) income (178) (256)
Balance, end of period 3,484 4,267
Accumulated Other Comprehensive Income (Loss) [Member]    
Accumulated Other Comprehensive Income Loss [Line Items]    
Balance, beginning of period (6,147) (10,667)
Reclassifications to earnings (116) 169
Other comprehensive (loss) income (116) 169
Balance, end of period $ (6,263) $ (10,498)
[1] These amounts are included in the computation of net periodic benefit cost. See Note 15, “Pension Plans and Other Postretirement Benefits.”