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Business Combinations - Narrative (Details) $ / shares in Units, £ in Millions, $ in Millions |  |  | 3 Months Ended |
--- | --- | --- | --- | ---
Aug. 20, 2019 USD ($) | Aug. 20, 2019 GBP (£) | Jun. 12, 2019 USD ($) | Dec. 27, 2019 $ / shares | Dec. 28, 2018 USD ($) | Sep. 27, 2019 $ / shares
Business Acquisition [Line Items] |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ / shares |  |  |  | $ 1 |  | $ 1
Acquired finite-lived intangible assets, weighted average useful life |  |  |  | 9 years |  |
Developed Technology Rights |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  |  | 12 years |  |
Customer Relationships Contracts and Backlog |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life |  |  |  | 10 years |  |
KeyW Holding Corporation |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
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 combination, consideration, debt assumed |  |  | 382.2 |  |  |
Business combination, cash acquired |  |  | 29.1 |  |  |
Business combination prepayment penalty |  |  | 298.4 |  |  |
Business acquisitions pro forma income tax expense (benefit) |  |  |  |  | $ 23.3 |
Goodwill recognized expected to be deductible for tax purposes |  |  | 136.0 |  |  |
Short term debt |  |  | $ 298.4 |  |  |
John Wood Group's Nuclear Business |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Consideration transferred | $ 300.0 | £ 250.0 |  |  |  |

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