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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Sep. 29, 2017
Defined Benefit Plan Disclosure [Line Items] |  |  |
(Gain) Loss on pension and retiree medical plan changes | $ 33,087 | $ (5,414) | $ 9,955
Total Other Non-current Assets |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Restricted investments |  |  | 7,700
Employee loans receivable |  |  | 2,200
SG&A Expense |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost |  | 24,200 | 13,500
One-time, non-cash benefit |  |  | 9,900
U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Period of annual average returns used in return on plan assets simulation model (in years) | 20 years |  |
Service cost | $ 2,784 | 4,765 | 1,000
Curtailments/settlements/plan amendments | 9,751 | 9,434 |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 7,171 | 8,269 | $ 7,509
Curtailments/settlements/plan amendments | 5,814 | 5,496 |
US-GAAP Accounting Standards Update201707 | SG&A Expense |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 24,400 |  |
CH2M HILL Companies, Ltd. | Other | Other Expense |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Litigation settlement, expense | 35,000 |  |
United Kingdom | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, increase (decrease) due to pension ruling | 1,500 |  |
United Kingdom | Non-U.S. Plans | Other Comprehensive Income (Loss) |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, increase (decrease) due to pension ruling | 38,200 |  |
Sverdrup and Ireland Pension Plans | CH2M Retiree Medical and Ireland | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
(Gain) Loss on pension and retiree medical plan changes | $ (33,100) |  |
Sverdrup and Ireland Pension Plans | Sverdrup and Ireland | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
(Gain) Loss on pension and retiree medical plan changes |  | $ (5,400) |

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