Defined Benefit Pension Plans - The Activity Within Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 24, 2023	Sep. 25, 2022	Sep. 26, 2021
Comprehensive (loss) income, net of taxes:
Change in unrecognized benefit plan gain (loss) arising during the period, net of taxes $240, $279, and $19,148, respectively	$ (560)	$ (14,485)	$ 59,663
Amortization of items to periodic pension and other post-employment benefit costs during the period, net of taxes $3,414, $6,389, and $819, respectively	10,750	(11,049)	2,574
Other comprehensive (loss) income recognized in operations, net of taxes	10,190	(25,534)	62,237
Change in unrecognized benefit plan gain (loss) arising during the period, tax	240	279	19,148
Amortization of items to periodic pension and other post-employment benefit costs during the period, tax	$ 3,414	$ 6,389	$ 819