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Basis of Presentation (Details) - USD ($) shares in Millions, $ in Millions |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Jun. 12, 2019 | Apr. 26, 2019 | Dec. 15, 2017 | Jun. 28, 2019 | Jun. 29, 2018 | Jun. 28, 2019 | Jun. 29, 2018
KeyW Holding Corporation |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Consideration transferred | $ 902.6 |  |  |  |  |  |
Business combination consideration paid in cash | 604.2 |  |  |  |  |  |
Business combination, cash acquired | $ 29.1 |  |  |  |  |  |
Percentage of outstanding shares of common and preferred stock acquired | 100.00% |  |  |  |  |  |
Business combination prepayment penalty | $ 22.6 |  |  |  |  |  |
Long-term debt | $ 275.8 |  |  |  |  |  |
ECR Business |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination consideration paid in cash |  | $ 2,800.0 |  |  |  |  |
Business combination consideration equity issued |  | 58.2 |  |  |  |  |
CH2M HILL Companies, Ltd. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Integration related activities |  | $ 3,400.0 |  | $ 17.3 | $ 12.6 | $ 30.8 | $ 40.6
Business combination consideration paid in cash |  |  | $ 1,800.0 |  |  |  |
Business combination, cash acquired |  |  | 315.2 |  |  |  |
Business combination consideration equity issued |  |  | $ 1,400.0 |  |  |  |
Percentage of outstanding shares of common and preferred stock acquired |  |  | 100.00% |  |  |  |
Business combination consideration equity issued, shares |  |  | 20.7 |  |  |  |
Long-term debt |  |  | $ 706.0 |  |  |  |
Revolving Credit Facility and Second Lien Notes | CH2M HILL Companies, Ltd. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Business combination prepayment penalty |  |  | 20.0 |  |  |  |
Long-term debt |  |  | $ 700.0 |  |  |  |

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