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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. 26, 2020
Sep. 28, 2019
Sep. 29, 2018
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance beginning $ (26,186) $ (24,670) $ (28,812)
Other comprehensive income before reclassifications (2,805) (3,723) 1,612
Recognition in earnings of net actuarial loss for pension settlement 1,051 0 0
Reclassifications to earnings 2,164 2,207 2,530
Other comprehensive income (loss) 410 (1,516) 4,142
Balance ending (25,776) (26,186) (24,670)
Pension Benefits [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance beginning (33,733) (33,180) (37,311)
Funded status benefit plan obligation (3,052) (4,019) 448
Recognition in earnings of net actuarial loss for pension settlement [1] 1,051 0 0
Balance ending (32,286) (33,733) (33,180)
Amortization of Net Loss [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Reclassifications to earnings [1] 3,448 3,466 3,683
Other comprehensive income (loss) 1,447 (553) 4,131
Post-Retirement Benefits [Member]      
Accumulated Other Comprehensive Income Loss [Line Items]      
Balance beginning 7,547 8,510 8,499
Funded status benefit plan obligation 247 296 1,164
Other comprehensive income (loss) (1,037) (963) 11
Balance ending 6,510 7,547 8,510
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] $ (786) $ (761) $ (655)
[1] These amounts are included in the computation of net periodic benefit cost.  See Note 12, “Employee Benefit Plans”.