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Balance Sheet Details - Accounts Receivable and Unbilled Receivables (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 25, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
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 |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total U.S. Government contract receivables | 92.0 | 103.3
Billed |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total current accounts receivable | 129.8 | 105.9
Billed | U.S. Government |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total U.S. Government contract receivables | 21.0 | 15.9
Unbilled |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total current accounts receivable | 200.5 | 223.0
Unbilled | U.S. Government |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total U.S. Government contract receivables | $ 71.0 | $ 87.4

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