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Postretirement and Postemployment Benefits - Fair Value Hierarchy of Benefit Plan Assets (Details) - USD ($) $ in Thousands | Sep. 25, 2022 | Sep. 26, 2021 | Sep. 27, 2020
--- | --- | --- | ---
NAV | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | $ 32,515 | $ 3,235 |
Level 1 | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Level 2 | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Level 3 | Hedge fund investments |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 0 | 0 |
Other Postretirement Benefits Plan |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 23,903 | 26,802 | $ 25,706
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 | 791 | 904 |
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 | 2,782 |  |
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 | 26 | 25 |
Other Postretirement Benefits Plan | Level 1 | Domestic equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 1,910 | 2,643 |
Other Postretirement Benefits Plan | Level 1 | Emerging equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 456 | 603 |
Other Postretirement Benefits Plan | Level 1 | International equity securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 573 | 747 |
Other Postretirement Benefits Plan | Level 1 | Debt Securities |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |
Postretirement assets | 17,248 | 18,363 |
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 | 480 | 660 |
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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