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Postretirement and Postemployment Benefits - 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 Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets |  | $ 2,782 |
Level 1 | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets |  | 0 |
Level 2 | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets |  | 0 |
Level 3 | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets |  | 0 |
Other Postretirement Benefits Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | $ 25,809 | 23,903 | $ 26,802
Other Postretirement Benefits Plan | NAV | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | NAV | Domestic equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 870 | 791 |
Other Postretirement Benefits Plan | NAV | Emerging equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | NAV | International equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | NAV | Debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | NAV | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 2,979 |  |
Other Postretirement Benefits Plan | Level 1 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 93 | 26 |
Other Postretirement Benefits Plan | Level 1 | Domestic equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 2,303 | 1,910 |
Other Postretirement Benefits Plan | Level 1 | Emerging equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 535 | 456 |
Other Postretirement Benefits Plan | Level 1 | International equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 814 | 573 |
Other Postretirement Benefits Plan | Level 1 | Debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 17,615 | 17,248 |
Other Postretirement Benefits Plan | Level 1 | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 |  |
Other Postretirement Benefits Plan | Level 2 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | Level 2 | Domestic equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | Level 2 | Emerging equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | Level 2 | International equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 600 | 480 |
Other Postretirement Benefits Plan | Level 2 | Debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | Level 2 | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 |  |
Other Postretirement Benefits Plan | Level 3 | Cash and cash equivalents |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | Level 3 | Domestic equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | Level 3 | Emerging equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | Level 3 | International equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan | Level 3 | Debt securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | $ 0 |
Other Postretirement Benefits Plan | Level 3 | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | $ 0 |  |

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