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Employee Pension and Profit Sharing Plans - Schedule of Net Benefit Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Retirement Benefits [Abstract]
Service cost	$ 2,996	$ 6,391	$ 7,121
Interest cost	9,180	11,287	10,579
Expected return on plan assets	(18,883)	(22,970)	(22,864)
Settlements and curtailments	0	283	3,312
Amortization of prior service cost	26	104	116
Recognized net loss	2,324	1,094	1,646
Net periodic pension income	$ (4,357)	$ (3,811)	$ (90)

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Amount of gain (loss), recognized immediately as component of net periodic benefit (cost) credit, for change in value of benefit obligation or plan assets from experience different from that assumed, change in actuarial assumption, or consequence of temporarily deviating from substantive plan. Includes, but is not limited to, amount in excess of ten percent of greater of fair value of plan assets or benefit obligation.

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