Retirement Plans (Fair Values of Qualified Plan's Assets) (Details) - USD ($) $ in Thousands	Oct. 03, 2021	Sep. 27, 2020
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 409,708	$ 365,510
Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,969	3,665
Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	66,921	83,676
International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	63,087	81,228
Investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	219,295	126,630
High yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,156	9,270
Alternatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	26,519	29,375
Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	21,761	31,666
Quoted Prices in Active Markets for Identical (Level 1)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	128,906	136,271
Quoted Prices in Active Markets for Identical (Level 1) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Quoted Prices in Active Markets for Identical (Level 1) | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	66,921	83,676
Quoted Prices in Active Markets for Identical (Level 1) | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	31,128	40,319
Quoted Prices in Active Markets for Identical (Level 1) | Investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	20,701	3,006
Quoted Prices in Active Markets for Identical (Level 1) | High yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	10,156	9,270
Quoted Prices in Active Markets for Identical (Level 1) | Alternatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Quoted Prices in Active Markets for Identical (Level 1) | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	200,563	127,289
Significant Other Observable Inputs (Level 2) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1,969	3,665
Significant Other Observable Inputs (Level 2) | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	198,594	123,624
Significant Other Observable Inputs (Level 2) | High yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Alternatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Other Observable Inputs (Level 2) | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Domestic equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | International equities
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Investment grade
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | High yield
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Alternatives
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0
Significant Unobservable Inputs (Level 3) | Real estate
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 0	$ 0