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Balance Sheet Details | 12 Months Ended
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Dec. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract] |
Balance Sheet Details | Balance Sheet Details The detail of certain assets in the consolidated balance sheets consists of the following: Cash and cash equivalents The Company’s cash equivalents consist of overnight cash sweep accounts that are invested on a daily basis. Cash and cash equivalents at December 30, 2018 and December 31, 2017 were $182.7 million and $130.5 million, respectively, and approximated their fair value. Accounts receivable, net Receivables including amounts due under long-term contracts are summarized as follows (in millions):
| December 30, 2018 |  | December 31, 2017
Billed, current | $ | 66.5 |  |  | $ | 74.3 |
Unbilled, current | 173.2 |  |  | 138.5 |
Total current accounts receivable | 239.7 |  |  | 212.8 |
Allowance for doubtful accounts | (2.3 | ) |  | (0.5 | )
Total accounts receivable, net | $ | 237.4 |  |  | $ | 212.3 |
Unbilled receivables represent the balance of recoverable costs and accrued profit, composed principally of revenue recognized on contracts for which billings have not been presented to the customer because the amounts were earned but not contractually billable as of the balance sheet date. Substantially all accounts receivable at December 30, 2018, are expected to be collected in 2019. The Company does not believe it has significant exposure to credit risk, as accounts receivable and the related unbilled amounts are primarily from contracts where the end customer is the U.S. Government. U.S. Government contract receivables where the Company is the prime contractor included in accounts receivable, net (in millions):
| December 30, 2018 |  | December 31, 2017
Billed | $ | 16.5 |  |  | $ | 16.9 |
Unbilled | 83.1 |  |  | 55.1 |
Total U.S. Government contract receivables | $ | 99.6 |  |  | $ | 72.0 |
Inventoried costs, net of progress payments (in millions):
| December 30, 2018 |  | December 31, 2017
Raw materials | $ | 34.7 |  |  | $ | 35.9 |
Work in process | 10.3 |  |  | 11.4 |
Finished goods | 1.8 |  |  | 2.3 |
Subtotal inventoried costs | 46.8 |  |  | 49.6 |
Less customer advances and progress payments | — |  |  | (0.6 | )
Total inventoried costs | $ | 46.8 |  |  | $ | 49.0 |
Property, plant and equipment, net (in millions)
| December 30, 2018 |  | December 31, 2017
Land and buildings | $ | 11.9 |  |  | $ | 12.1 |
Computer equipment and software | 28.3 |  |  | 27.3 |
Machinery and equipment | 56.8 |  |  | 49.7 |
Furniture and office equipment | 6.3 |  |  | 5.1 |
Leasehold improvements | 10.9 |  |  | 10.1 |
Construction in progress | 21.5 |  |  | 17.3 |
Property and equipment | 135.7 |  |  | 121.6 |
Accumulated depreciation and amortization | (68.6 | ) |  | (63.6 | )
Total property and equipment, net | $ | 67.1 |  |  | $ | 58.0 |
Depreciation expense was $12.0 million, $11.8 million and $12.0 million for the years ended December 30, 2018, December 31, 2017, and December 25, 2016, respectively.

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- Definition The entire disclosure for supplemental balance sheet disclosures, including descriptions and amounts for assets, liabilities, and equity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -URI http://asc.fasb.org/topic&trid=2122208 + Details
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