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Balance Sheet Details - Accounts Receivable and Inventory (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 25, 2016 | Dec. 27, 2015 | Dec. 28, 2014
--- | --- | --- | --- | ---
Cash and Cash Equivalents |  |  |  |
Cash and cash equivalents | $ 129.6 | $ 69.1 | $ 28.5 | $ 33.5
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total current accounts receivable | 269.0 | 231.1 |  |
Allowance for doubtful accounts | (0.6) | (1.7) |  |
Total accounts receivable, net | 268.4 | 229.4 |  |
Retainages receivable | 6.6 | 6.2 |  |
Inventory, Net of Allowances, Customer Advances and Progress Billings [Abstract] |  |  |  |
Raw materials | 35.4 | 31.9 |  |
Work in process | 11.4 | 22.1 |  |
Finished goods | 2.3 | 1.4 |  |
Supplies and other | 1.9 | 1.8 |  |
Subtotal inventoried costs | 51.0 | 57.2 |  |
Less customer advances and progress payments | (0.6) | (1.8) |  |
Total inventoried costs | 50.4 | 55.4 |  |
Billed |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total current accounts receivable | 101.5 | 102.8 |  |
Unbilled |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total current accounts receivable | 167.5 | 128.3 |  |
U.S. Government |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total U.S. Government contract receivables | 72.6 | 54.9 |  |
U.S. Government | Billed |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total U.S. Government contract receivables | 17.3 | 15.6 |  |
U.S. Government | Unbilled |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Total U.S. Government contract receivables | $ 55.3 | $ 39.3 |  |

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