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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Dec. 31, 2017 | Jun. 28, 2019 | Mar. 29, 2019 | Dec. 28, 2018 | Jun. 29, 2018 | Jun. 28, 2019 | Jun. 29, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Service cost |  | $ 1,212 |  |  | $ 1,486 | $ 5,545 | $ 6,463
Plan Amendment and settlement gain |  | 0 | $ 32,400 |  | 0 | 34,621 | (3,819)
Increase due to pension ruling |  |  |  | $ 38,200 |  | 1,200 |
Accounting Standards Update 2017-07 | Miscellaneous Income (Expense), Net |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Service cost |  | $ 6,100 |  |  | $ 6,100 | $ 18,300 | $ 18,200
CH2M Hill and OMI Retiree Medical Plans |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Plan Amendment and settlement gain |  |  |  | $ 2,200 |  |  |
Sverdrup Pension Plan |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Plan Amendment and settlement gain | $ (3,800) |  |  |  |  |  |

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