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Business Combinations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Sep. 28, 2018 | Dec. 15, 2017 | Sep. 29, 2017
--- | --- | --- | ---
Assets |  |  |
Goodwill | $ 6,103,856 |  | $ 3,009,826
CH2M HILL Companies, Ltd. |  |  |
Assets |  |  |
Cash and cash equivalents |  | $ 315,200 |
Receivables |  | 1,124,600 |
Prepaid expenses and other |  | 72,700 |
Property, equipment and improvements, net |  | 175,100 |
Goodwill |  | 3,129,100 |
Identifiable intangible assets: |  |  |
Total identifiable intangible assets |  | 416,700 |
Miscellaneous |  | 522,900 |
Total Assets |  | 5,756,300 |
Liabilities |  |  |
Notes payable |  | 2,200 |
Accounts payable |  | 309,600 |
Accrued liabilities |  | 753,100 |
Billings in excess of costs |  | 260,800 |
Identifiable intangible liabilities: |  |  |
Lease intangible liabilities |  | 9,600 |
Long-term debt |  | 706,000 |
Other deferred liabilities |  | 653,000 |
Total Liabilities |  | 2,694,300 |
Noncontrolling interests |  | (37,300) |
Net assets acquired |  | 3,024,700 |
CH2M HILL Companies, Ltd. | Customer relationships, contracts and backlog |  |  |
Identifiable intangible assets: |  |  |
Total identifiable intangible assets |  | 412,300 |
CH2M HILL Companies, Ltd. | Lease intangible assets |  |  |
Identifiable intangible assets: |  |  |
Total identifiable intangible assets |  | $ 4,400 |

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- Definition Amount due from customers or clients for goods or services, including trade receivables, that have been delivered or sold in the normal course of business, and amounts due from others, including related parties expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer, acquired at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84161108&loc=d3e4845-128472 + Details
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