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Benefit Plans - Projected Benefit Obligation (Details) - Pension Plan - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2021	Oct. 03, 2020	Sep. 28, 2019
Change in benefit obligation
Projected benefit obligation balance, beginning of year	$ 169,741	$ 163,572
Interest cost	4,227	4,947	$ 6,047
Assumption changes	(6,580)	9,750
Actuarial gain	(47)	(315)
Benefits paid	(7,253)	(8,213)
Projected benefit obligations balance, end of year	$ 160,088	$ 169,741	$ 163,572

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- Definition

Defined Benefit Plan, Gain (Loss) from Assumption Changes

+ References

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- Definition

Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan.

+ References

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Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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

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