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Acquisitions - Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 25, 2022 | May 23, 2022 | Dec. 27, 2021
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Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 569.1 | $ 558.2 |  |
Cosmic Advanced Engineering Solutions, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  |  |  | $ 3.8
Unbilled receivables |  |  |  | 4.1
Other current assets |  |  |  | 0.1
Property and equipment |  |  |  | 1.3
Intangible assets |  |  |  | 8.5
Total identifiable net assets acquired |  |  |  | 17.8
Total identifiable net liabilities assumed |  |  |  | (9.1)
Goodwill |  |  |  | 29.2
Net assets acquired, excluding cash |  |  |  | $ 37.9
Southern Research Engineering Division |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Accounts receivable |  |  | $ 2.9 |
Unbilled receivables |  |  | 11.1 |
Inventory |  |  | 0.5 |
Other current assets |  |  | 0.2 |
Property and equipment |  |  | 22.8 |
Other assets |  |  | 0.2 |
Intangible assets |  |  | 10.8 |
Total identifiable net assets acquired |  |  | 48.5 |
Total identifiable net liabilities assumed |  |  | (3.4) |
Goodwill |  |  | 34.3 |
Net assets acquired, excluding cash |  |  | $ 79.4 |

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