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Business Combinations - Narrative (Details) £ in Millions, shares in Millions |  |  |  | 3 Months Ended | 4 Months Ended | 12 Months Ended | 21 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 20, 2019 USD ($) | Aug. 20, 2019 GBP (£) | Jun. 12, 2019 USD ($) | Dec. 15, 2017 USD ($) shares | Sep. 27, 2019 USD ($) | Dec. 28, 2018 USD ($) | Sep. 27, 2019 USD ($) | Sep. 27, 2019 USD ($) | Sep. 28, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Goodwill recognized expected to be deductible for tax purposes |  |  | $ 136,000,000.0 |  |  |  |  |  |
KeyW Holding Corporation |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of outstanding shares of common and preferred stock acquired |  |  | 100.00% |  |  |  |  |  |
Business combination consideration paid in cash |  |  | $ 604,200,000 |  |  |  |  |  |
Business combination, cash acquired |  |  | 29,100,000 |  |  |  |  |  |
Short term debt |  |  | 22,600,000 |  |  |  |  |  |
Business combination assumed revolving credit facility and second lien notes |  |  | 275,800,000 |  |  |  |  |  |
Adjustments to accrued liabilities and other deferred liabilities |  |  |  |  | $ 7,500,000 |  |  |  |
Decrease in intangible assets |  |  |  |  | 9,300,000 |  |  |  |
Increase in other assets excluding goodwill |  |  |  |  | 7,400,000 |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill |  |  |  |  | 9,400,000 |  |  |  |
Revenue contributed by acquiree from acquisition date |  |  |  |  |  |  | $ 136,300,000 |  |
Net earnings contributed by acquiree from acquisition date |  |  |  |  |  |  | 17,700,000 |  |
Consideration transferred |  |  | 902,600,000 |  |  |  |  |  |
Business acquisition, transaction costs |  |  |  |  | 12,900,000 |  | $ 12,900,000 | $ 12,900,000 |
Short term debt |  |  | $ 298,400,000 |  |  |  |  |  |
KeyW Holding Corporation | Customer Relationships |  |  |  |  |  |  |  |  |
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 | Noncompete Agreements |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  |  |  |  |  |  | 9 years |
KeyW Holding Corporation | Contract and backlog intangible |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  |  |  |  |  |  | 10 years |
CH2M HILL Companies, Ltd. |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Percentage of outstanding shares of common and preferred stock acquired |  |  |  | 100.00% |  |  |  |  |
Business combination consideration paid in cash |  |  |  | $ 1,800,000,000 |  |  |  |  |
Business combination, cash acquired |  |  |  | 315,200,000 |  |  |  |  |
Business combination consideration equity issued |  |  |  | $ 1,400,000,000 |  |  |  |  |
Business combination consideration equity issued, shares | shares |  |  |  | 20.7 |  |  |  |  |
Business combination assumed revolving credit facility and second lien notes |  |  |  | $ 706,000,000.0 |  |  |  |  |
Goodwill recognized expected to be deductible for tax purposes |  |  |  | 0 |  |  |  |  |
Adjustments to accrued liabilities and other deferred liabilities |  |  |  | 404,700,000 |  |  |  |  |
Decrease in receivables |  |  |  |  |  | $ (4,000,000.0) |  |  |
Increase in accrued liabilities |  |  |  |  | 51,800,000 | 11,500,000 |  |  |
Increase in long-term assets |  |  |  |  |  | $ 20,700,000 |  |  |
Decrease in miscellaneous long-term assets |  |  |  |  | $ (12,800,000) |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Goodwill |  |  |  |  |  |  |  | $ 36,400,000 |
Revenue contributed by acquiree from acquisition date |  |  |  |  |  |  |  |  | $ 3,800,000,000
Net earnings contributed by acquiree from acquisition date |  |  |  |  |  |  |  |  | 185,900,000
Pre-tax restructuring and transaction costs |  |  |  |  |  |  |  |  | $ 99,300,000
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  |  |  |  |  |  | 10 years |
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog | Minimum |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  | 9 years |
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog | Maximum |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Finite-lived intangible asset, useful life |  |  |  |  |  |  |  | 11 years |
CH2M HILL Companies, Ltd. | Other Intangible Assets and Liabilities |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  |  |  |  |  |  | 10 years |
CH2M HILL Companies, Ltd. | Revolving Credit Facility and Second Lien Notes |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Short term debt |  |  |  | 20,000,000.0 |  |  |  |  |
Business combination assumed revolving credit facility and second lien notes |  |  |  | $ 700,000,000 |  |  |  |  |
John Wood Group's Nuclear Consulting |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |
Consideration transferred | $ 300,000,000 | £ 250 |  |  |  |  |  |  |

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