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Balance Sheet Details - Accounts Receivable and Inventory (Details) - USD ($) $ in Millions | Dec. 29, 2019 | Dec. 30, 2018
--- | --- | ---
Cash and Cash Equivalents |  |
Cash and cash equivalents | $ 172.6 | $ 182.7
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total current accounts receivable | 266.3 | 239.7
Allowance for doubtful accounts | (1.9) | (2.3)
Total accounts receivable and unbilled receivables, net | 264.4 | 237.4
Inventory, Net of Allowances, Customer Advances and Progress Billings [Abstract] |  |
Raw materials | 39.1 | 34.7
Work in process | 20.3 | 10.3
Finished goods | 1.7 | 1.8
Total inventoried costs | 61.1 | 46.8
Billed |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total current accounts receivable | 86.6 | 66.5
Unbilled |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total current accounts receivable | 179.7 | 173.2
U.S. Government |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total U.S. Government contract receivables | 103.0 | 99.6
U.S. Government | Billed |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total U.S. Government contract receivables | 16.6 | 16.5
U.S. Government | Unbilled |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total U.S. Government contract receivables | $ 86.4 | $ 83.1

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