Defined Benefit Pension Plans - The Activity Within Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 25, 2022	Sep. 26, 2021	Sep. 27, 2020
Comprehensive (loss) income, net of taxes:
Change in unrecognized benefit plan gain (loss) arising during the period, net of taxes $279, $19,148, and $4,095, respectively	$ (14,485)	$ 59,663	$ 10,329
Amortization of items to periodic pension and other post-employment benefit costs during the period, net of taxes $6,389, $819, and $542, respectively	(11,049)	2,574	(1,265)
Other comprehensive (loss) income recognized in operations, net of taxes	(25,534)	62,237	9,064
Change in unrecognized benefit plan gain (loss) arising during the period, tax	279	19,148	4,095
Amortization of items to periodic pension and other post-employment benefit costs during the period, tax	$ 6,389	$ 819	$ 542