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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jul. 02, 2021 | Jun. 26, 2020 | Mar. 27, 2020 | Jul. 02, 2021 | Jun. 26, 2020 | Mar. 02, 2021
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement loss | $ 0 | $ 0 |  | $ 0 | $ 2,651 |
PA Consulting Group Limited |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Percentage of outstanding shares of common and preferred stock acquired |  |  |  |  |  | 65.00%
CH2M Hill and OMI Retiree Medical Plans |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |
Settlement loss |  |  | $ 2,700 |  |  |

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