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Goodwill and Intangibles - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 30, 2018 Business | Dec. 30, 2016 USD ($) | Mar. 27, 2015 Business | Sep. 28, 2018 USD ($) segment | Sep. 29, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 29, 2017 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Number of operating and reporting structure of business | 3 |  | 4 | 3 |  |  |
Overall foreign currency translation adjustment |  | $ (140,500) |  | $ 109,877 | $ 140,527 | $ 46,515 |
CH2M HILL Companies, Ltd. |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Lease intangible liabilities |  |  |  | $ 8,700 |  |  | $ 9,600
Goodwill Adjustment |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Overstatement adjustment of financial statements line item |  | 209,900 |  |  |  |  |
Other Comprehensive Income Adjustment |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Overstatement adjustment of financial statements line item |  | $ 33,800 |  |  |  |  |

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