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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Oct. 02, 2020 | Sep. 27, 2019 | Sep. 28, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |
(Gain) Loss on pension and retiree medical plan changes | $ (4,598) | $ 33,087 | $ (5,414)
SG&A Expense |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost |  |  | 24,200
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 | $ 409 | 2,784 | 4,765
Gain on litigation settlement | (2,700) |  |
Curtailments/settlements/plan amendments | 18,557 | 9,751 |
Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Service cost | 5,710 | 7,171 | $ 8,269
Curtailments/settlements/plan amendments | 4,782 | 5,814 |
CH2M HILL Companies, Ltd. | Other | Other Expense |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Gain on litigation settlement |  | 35,000 |
United Kingdom | Non-U.S. Plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined benefit plan, increase (decrease) due to pension ruling |  | 38,200 |
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 |  | 1,500 |
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 | $ 4,600 | $ (33,100) |

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