Consolidated Statements of Comprehensive Income - USD ($)	12 Months Ended
	Oct. 03, 2021	Sep. 27, 2020	Sep. 29, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 165,755,000	$ 89,764,000	$ 94,437,000
Unrecognized periodic benefit costs:
Actuarial gains (losses) arising during the period	44,134,000	(4,875,000)	(62,377,000)
Actuarial losses and prior service cost reclassified to earnings	4,931,000	44,616,000	3,917,000
Unrecognized periodic benefit costs, before tax	49,065,000	39,741,000	(58,460,000)
Tax effect	(12,714,000)	(10,340,000)	15,176,000
Unrecognized periodic benefit costs, net of tax	36,351,000	29,401,000	(43,284,000)
Cash flow hedges:
Net change in fair value of derivatives			(23,625,000)
Net loss reclassified to earnings			24,328,000
Cash flow hedges			703,000
Tax effect			(3,165,000)
Cash flow hedges, net of tax			(2,462,000)
Other comprehensive income (loss), net of taxes	36,351,000	29,401,000	(45,746,000)
Comprehensive income	$ 202,106,000	$ 119,165,000	$ 48,691,000