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Retirement Plans (Components of Net Periodic Benefit Cost) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 29, 2019	Sep. 30, 2018	Oct. 01, 2017
Supplemental Employee Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	$ 3,080	$ 2,894	$ 2,850
Actuarial loss	1,207	1,538	1,659
Service cost	0	490	855
Amortization of unrecognized prior service cost	115	146	153
Net periodic benefit (credit) cost	4,402	5,068	5,517
Postretirement Health Plans
Defined Benefit Plan Disclosure [Line Items]
Interest cost	997	955	1,003
Actuarial loss	(159)	(27)	162
Service cost	0	0
Net periodic benefit (credit) cost	838	928	1,165
Qualified Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Interest cost	19,825	19,463	19,889
Expected return on plan assets	(26,334)	(26,467)	(26,811)
Actuarial loss	2,754	3,331	4,455
Service cost	0	1,743
Net periodic benefit (credit) cost	$ (3,755)	$ (3,673)	$ (2,467)

X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan.

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Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan.

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Amount of cost recognized for passage of time related to defined benefit plan.

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