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Other Business Combinations - Narrative (Details) - USD ($) shares in Millions, $ in Millions |  |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Nov. 19, 2021 | Nov. 24, 2020 | Mar. 06, 2020 | Jun. 12, 2019 | Dec. 15, 2017 | Sep. 27, 2019
Customer relationships, contracts and backlog intangible |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  | 9 years |  |  |  |
Buffalo Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred |  | $ 190.1 |  |  |  |
Business combination consideration paid in cash |  | 182.4 |  |  |  |
Contingent consideration |  | 7.7 |  |  |  |
Long term liabilities |  | 7.7 |  |  |  |
Cash and cash equivalents |  | $ 8.4 |  |  |  |
Wood Group |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Long term liabilities |  |  | $ 28.5 |  |  |
Business combination, enterprise value |  |  | 246.0 |  |  |
Business combinations, less cash |  |  | 317.9 |  |  |
Cash and cash equivalents |  |  | $ 24.3 |  |  |
Wood Group | Customer relationships, contracts and backlog intangible |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  | 12 years |  |  |
Wood Group | Developed Technology |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  | 15 years |  |  |
KeyW Holding Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred |  |  |  | $ 902.6 |  |
Business combination consideration paid in cash |  |  |  | 604.2 |  |
Short term debt |  |  |  | 298.4 |  |
Goodwill recognized expected to be deductible for tax purposes |  |  |  | 136.3 |  |
Cash and cash equivalents |  |  |  | $ 29.1 |  |
Business acquisitions pro forma income tax expense (benefit) |  |  |  |  |  | $ 41.3
Percentage of outstanding shares of common and preferred stock acquired |  |  |  | 100.00% |  |
Short term debt |  |  |  | $ 298.4 |  |
KeyW Holding Corporation | Customer relationships, contracts and backlog intangible |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  |  | 10 years |  |
KeyW Holding Corporation | Developed Technology |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  |  | 12 years |  |
KeyW Holding Corporation | Other Intangible Assets and Liabilities |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  |  | 9 years |  |
CH2M HILL Companies, Ltd. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination consideration paid in cash |  |  |  |  | $ 1,800.0 |
Goodwill recognized expected to be deductible for tax purposes |  |  |  |  | 0.0 |
Long term liabilities |  |  |  |  | 706.0 |
Cash and cash equivalents |  |  |  |  | $ 315.2 |
Percentage of outstanding shares of common and preferred stock acquired |  |  |  |  | 100.00% |
Business combination consideration equity issued |  |  |  |  | $ 1,400.0 |
Business combination consideration equity issued, shares |  |  |  |  | 20.7 |
Adjustments to accrued liabilities and other deferred liabilities |  |  |  |  | $ 404.7 |
BlackLynx | Subsequent Event |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred | $ 257.5 |  |  |  |  |
Business combination consideration paid in cash | 250.0 |  |  |  |  |
Contingent consideration | $ 7.5 |  |  |  |  |

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