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Pension and Other Postretirement Benefit Plans - Schedule of Pension Plans' Expense (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jun. 28, 2019	Mar. 29, 2019	Jun. 29, 2018	Jun. 28, 2019	Jun. 29, 2018
Component:
Service cost	$ 1,212		$ 1,486	$ 5,545	$ 6,463
Interest cost	17,088		14,566	52,916	44,850
Expected return on plan assets	(26,291)		(24,378)	(79,709)	(74,053)
Amortization of previously unrecognized items	3,182		2,440	9,353	7,240
Plan Amendment and settlement loss (gain)	0	$ (32,400)	0	(34,621)	3,819
Net periodic benefit	$ (4,809)		$ (5,886)	$ (46,516)	$ (11,681)

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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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Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

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

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