Defined Benefit Pension Plans - Fair Value Hierarchy of Benefit Plan Assets (Details) - USD ($) $ in Thousands	Sep. 24, 2023	Sep. 25, 2022	Sep. 26, 2021
NAV | Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Pension assets		$ 2,782
Level 1 | Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Pension assets		0
Level 2 | Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Pension assets		0
Level 3 | Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Pension assets		0
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$ 210,031	211,058	$ 400,907
Pension Plan | NAV | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | NAV | Domestic equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	2,252	2,235
Pension Plan | NAV | International equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | NAV | Emerging equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | NAV | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | NAV | Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Pension assets	24,441	32,515
Pension Plan | Level 1 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension assets	1,937	1,562
Pension Plan | Level 1 | Domestic equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	30,885	67,661
Pension Plan | Level 1 | International equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	7,565	5,743
Pension Plan | Level 1 | Emerging equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	6,263	4,996
Pension Plan | Level 1 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	78,740	25,742
Pension Plan | Level 1 | Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | Level 2 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | Level 2 | Domestic equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | Level 2 | International equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	5,644	4,519
Pension Plan | Level 2 | Emerging equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | Level 2 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	52,304	65,364
Pension Plan | Level 2 | Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | Level 3 | Cash and cash equivalents
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | Level 3 | Domestic equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | Level 3 | International equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | Level 3 | Emerging equity securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | Level 3 | Debt securities
Defined Benefit Plan Disclosure [Line Items]
Pension assets	0	0
Pension Plan | Level 3 | Hedge fund investments
Defined Benefit Plan Disclosure [Line Items]
Pension assets	$ 0	$ 0