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Description of Business and Basis of Presentation - Basis of Presentation, Acquisition Narrative (Details) £ in Millions, shares in Millions, $ in Millions |  |  |  |  | 12 Months Ended
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Mar. 06, 2020 GBP (£) | Mar. 06, 2020 USD ($) | Jun. 12, 2019 USD ($) | Apr. 26, 2019 USD ($) shares | Dec. 15, 2017 USD ($) shares | Oct. 02, 2020 segment
Business Acquisition [Line Items] |  |  |  |  |  |
Number of lines of business | segment |  |  |  |  |  | 2
Worley Stock |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Equity instrument consideration, shares | shares |  |  |  | 58.2 |  |
ECR Business |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred |  |  |  | $ 3,400.0 |  |
Business combination consideration paid in cash |  |  |  | $ 2,800.0 |  |
John Wood Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Enterprise value on debt-free, cash-free basis (USD, GBP) | £ 246 | $ 317.9 |  |  |  |
Business combination, cash acquired |  | 24.3 |  |  |  |
Business combination assumed revolving credit facility and second lien notes |  | $ 29.2 |  |  |  |
KeyW Holding Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, cash acquired |  |  | $ 29.1 |  |  |
Percentage of outstanding shares of common and preferred stock acquired |  |  | 100.00% |  |  |
Consideration transferred |  |  | $ 902.6 |  |  |
Business combination consideration paid in cash |  |  | 604.2 |  |  |
Business combinatin, short term debt |  |  | $ 298.4 |  |  |
CH2M HILL Companies, Ltd. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, cash acquired |  |  |  |  | $ 315.2 |
Percentage of outstanding shares of common and preferred stock acquired |  |  |  |  | 100.00% |
Business combination consideration paid in cash |  |  |  |  | $ 1,800.0 |
Business combination consideration equity issued |  |  |  |  | $ 1,400.0 |
Business combination consideration equity issued, shares | shares |  |  |  |  | 20.7 |
Business combination assumed revolving credit facility and second lien notes |  |  |  |  | $ 706.0 |
Revolving Credit Facility and Second Lien Notes | CH2M HILL Companies, Ltd. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combinatin, short term debt |  |  |  |  | 20.0 |
Business combination assumed revolving credit facility and second lien notes |  |  |  |  | $ 700.0 |

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