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Business Combinations - Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Jun. 28, 2019 | Jun. 12, 2019 | Sep. 28, 2018 | Dec. 15, 2017
--- | --- | --- | --- | ---
Assets |  |  |  |
Goodwill | $ 5,370,741 |  | $ 4,795,856 |
KeyW Holding Corporation |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  | $ 29,100 |  |
Receivables |  | 81,500 |  |
Inventories, net |  | 25,200 |  |
Prepaid expenses and other |  | 2,500 |  |
Property, equipment and improvements, net |  | 24,000 |  |
Deferred tax asset and other |  | 25,800 |  |
Goodwill |  | 602,400 |  |
Identifiable intangible assets: |  |  |  |
Total identifiable intangible assets |  | 188,300 |  |
Total Assets |  | 978,800 |  |
Liabilities |  |  |  |
Accounts payable |  | 8,300 |  |
Accrued expenses |  | 62,700 |  |
Convertible senior notes - current portion |  | 22,600 |  |
Other current liabilities |  | 3,900 |  |
Long-term debt |  | 275,800 |  |
Identifiable intangible liabilities: |  |  |  |
Long-term debt |  | 275,800 |  |
Other deferred liabilities |  | 1,400 |  |
Total Liabilities |  | 374,700 |  |
Net assets acquired |  | $ 604,100 |  |
CH2M HILL Companies, Ltd. |  |  |  |
Assets |  |  |  |
Cash and cash equivalents |  |  |  | $ 315,200
Receivables |  |  |  | 1,120,600
Prepaid expenses and other |  |  |  | 72,700
Property, equipment and improvements, net |  |  |  | 175,100
Goodwill |  |  |  | 3,101,000
Identifiable intangible assets: |  |  |  |
Total identifiable intangible assets |  |  |  | 416,700
Miscellaneous |  |  |  | 543,600
Total Assets |  |  |  | 5,744,900
Liabilities |  |  |  |
Notes payable |  |  |  | 2,200
Accounts payable |  |  |  | 309,600
Accrued expenses |  |  |  | 735,700
Billings in excess of costs |  |  |  | 260,800
Identifiable intangible liabilities: |  |  |  |
Lease intangible liabilities |  |  |  | 9,600
Long-term debt |  |  |  | 706,000
Other deferred liabilities |  |  |  | 659,000
Total Liabilities |  |  |  | 2,682,900
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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