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Balance Sheet Details (Tables) | 12 Months Ended
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Dec. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Schedule of Accounts, Notes, Loans and Financing Receivable | U.S. Government contract receivables where the Company is the prime contractor included in accounts receivable, net (in millions)
| December 31, 2017 |  | December 25, 2016
Billed | $ | 17.3 |  |  | $ | 15.6 |
Unbilled | 55.3 |  |  | 39.3 |
Total U.S. Government contract receivables | $ | 72.6 |  |  | $ | 54.9 |
Receivables including amounts due under long-term contracts are summarized as follows:
| December 31, 2017 |  | December 25, 2016
Billed, current | $ | 101.5 |  |  | $ | 102.8 |
Unbilled, current | 167.5 |  |  | 128.3 |
Total current accounts receivable | 269.0 |  |  | 231.1 |
Allowance for doubtful accounts | (0.6 | ) |  | (1.7 | )
Total accounts receivable, net | $ | 268.4 |  |  | $ | 229.4 |
Schedule of Inventory, Current | Inventoried costs, net of progress payments (in millions)
| December 31, 2017 |  | December 25, 2016
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 |
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 – 10
Computer equipment and software | 1 – 10
Vehicles, furniture, and office equipment | 5
Leasehold improvements | Shorter of useful life or length of lease
Property and equipment, net (in millions)
| December 31, 2017 |  | December 25, 2016
Land and buildings | $ | 12.1 |  |  | $ | 12.2 |
Computer equipment and software | 30.1 |  |  | 26.9 |
Machinery and equipment | 49.9 |  |  | 47.2 |
Furniture and office equipment | 5.7 |  |  | 5.3 |
Leasehold improvements | 11.2 |  |  | 9.9 |
Construction in progress | 19.8 |  |  | 6.1 |
Property and equipment | 128.8 |  |  | 107.6 |
Accumulated depreciation and amortization | (67.6 | ) |  | (57.8 | )
Total property and equipment, net | $ | 61.2 |  |  | $ | 49.8 |

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- Definition Tabular disclosure of physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, balances by class of assets, depreciation and depletion expense and method used, including composite depreciation, and accumulated deprecation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(13)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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