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Business Combinations - Narrative (Details) - USD ($) shares in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Dec. 29, 2017 | Dec. 15, 2017 | Jun. 29, 2018 | Jun. 29, 2018
Business Acquisition [Line Items] |  |  |  |
Decrease in intangible assets |  |  |  | $ 3,421,000
Customer relationships, contracts and backlog |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Decrease in intangible assets |  |  |  | (200,000)
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 |  | 20.7 |  |
Business combination assumed revolving credit facility and second lien notes |  | $ 705,900,000 |  |
Goodwill recognized expected to be deductible for tax purposes |  | 0 |  |
Decrease in intangible assets |  |  | $ 186,200,000 |
Decrease in property, equipment and improvements |  |  | 50,500,000 |
Decrease in receivables |  |  | 45,900,000 |
Increase in accrued liabilities |  |  |  | $ 60,300,000
Increase in miscellaneous long-term assets |  |  | 75,800,000 |
Goodwill increase in the period |  |  | $ 268,300,000 |
Business combination assumed pensions and other long-term employee related liabilities included in deferred liabilities |  | 291,000,000 |  |
Revenue contributed by acquiree from acquisition date | $ 2,500,000,000 |  |  |
Net earnings contributed by acquiree from acquisition date | 87,900,000 |  |  |
Pre-tax restructuring and transaction costs | $ 93,300,000 |  |  |
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] |  |  |  |
Business combination prepayment penalty |  | 20,000,000 |  |
Business combination assumed revolving credit facility and second lien notes |  | $ 700,000,000 |  |

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