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Balance Sheet Details (Tables) | 12 Months Ended
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Dec. 31, 2023
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable | Receivables including amounts due under long-term contracts are summarized as follows (in millions):
| December 31, 2023 |  | December 25, 2022
Billed, current | $ | 129.8 |  |  | $ | 105.9 |
Unbilled, current | 200.5 |  |  | 223.0 |
Total current accounts receivable | 330.3 |  |  | 328.9 |
Allowance for doubtful accounts | (1.1) |  |  | (0.4) |
Total accounts receivable and unbilled receivables, net | $ | 329.2 |  |  | $ | 328.5 |
U.S. Government contract receivables where the Company is the prime contractor included in accounts receivable, net (in millions):
| December 31, 2023 |  | December 25, 2022
Billed | $ | 21.0 |  |  | $ | 15.9 |
Unbilled | 71.0 |  |  | 87.4 |
Total U.S. Government contract receivables | $ | 92.0 |  |  | $ | 103.3 |
Schedule of Inventory | Inventoried costs (in millions):
| December 31, 2023 |  | December 25, 2022
Raw materials | $ | 78.0 |  |  | $ | 73.6 |
Work in process | 72.9 |  |  | 50.8 |
Finished goods | 5.3 |  |  | 1.1 |
Total inventoried costs | $ | 156.2 |  |  | $ | 125.5 |
Schedule of Property, Plant and Equipment | Assets are depreciated predominately using the straight-line method, with the following lives:
| Years
Buildings and improvements | 15 – 39
Machinery and equipment | 3 – 20
Computer equipment and software | 1 – 10
Vehicles, furniture, and office equipment | 5
Leasehold improvements | Shorter of useful life or length of lease
Property, plant and equipment, net (in millions)
| December 31, 2023 |  | December 25, 2022
Finance lease right of use assets | $ | 56.1 |  |  | $ | 54.9 |
Land and buildings | 40.8 |  |  | 38.4 |
Computer equipment and software | 51.4 |  |  | 45.7 |
Machinery and equipment | 152.8 |  |  | 129.9 |
Furniture and office equipment | 8.2 |  |  | 7.6 |
Leasehold improvements | 24.0 |  |  | 22.9 |
Construction in progress | 69.7 |  |  | 51.0 |
Property and equipment | 403.0 |  |  | 350.4 |
Accumulated depreciation and amortization | (159.4) |  |  | (137.3) |
Total property and equipment, net | $ | 243.6 |  |  | $ | 213.1 |

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