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Summary of Significant Accounting Policies - Balance Sheet (Details) - USD ($) $ in Millions | Apr. 01, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 25, 2016
--- | --- | --- | --- | ---
Assets |  |  |  |
Accounts receivable, net | $ 57.7 |  | $ 74.2 |
Unbilled receivable, net | 151.2 |  | 138.1 |
Inventoried costs | 48.2 |  | 49.0 |
Liabilities |  |  |  |
Accrued expenses | 33.8 |  | 40.9 |
Billings in excess of costs and earnings on uncompleted contracts | 38.2 |  | 42.8 |
Stockholders’ equity: |  |  |  |
Accumulated deficit | (723.2) |  | (720.8) |
ASC 606 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Impact from adoption of ASC 606 |  |  | $ (0.2) | $ 0.0
Assets |  |  |  |
Unbilled receivable, net |  | $ 139.4 |  |
Inventoried costs |  | 48.7 |  |
Liabilities |  |  |  |
Accrued expenses |  | 40.3 |  |
Billings in excess of costs and earnings on uncompleted contracts |  | 44.6 |  |
Stockholders’ equity: |  |  |  |
Accumulated deficit |  | (721.0) |  |
ASC 606 | Balances Without Adoption of ASC 606 |  |  |  |
Assets |  |  |  |
Accounts receivable, net | 55.6 |  |  |
Unbilled receivable, net | 147.1 |  |  |
Inventoried costs | 52.4 |  |  |
Liabilities |  |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 39.7 |  |  |
Stockholders’ equity: |  |  |  |
Accumulated deficit | (726.7) |  |  |
ASC 606 | Effect of Change Higher/(Lower) |  |  |  |
Assets |  |  |  |
Accounts receivable, net | 2.1 |  |  |
Unbilled receivable, net | 4.1 |  |  |
Inventoried costs | (4.2) |  |  |
Liabilities |  |  |  |
Billings in excess of costs and earnings on uncompleted contracts | (1.5) |  |  |
Stockholders’ equity: |  |  |  |
Accumulated deficit | $ 3.5 |  |  |
Balance at January 1, 2018 | ASC 606 |  |  |  |
Assets |  |  |  |
Unbilled receivable, net |  | 138.1 |  |
Inventoried costs |  | 49.0 |  |
Liabilities |  |  |  |
Accrued expenses |  | 40.9 |  |
Billings in excess of costs and earnings on uncompleted contracts |  | 42.8 |  |
Stockholders’ equity: |  |  |  |
Accumulated deficit |  | (720.8) |  |
ASC 606 Adjustment | ASC 606 |  |  |  |
Assets |  |  |  |
Unbilled receivable, net |  | 1.3 |  |
Inventoried costs |  | (0.3) |  |
Liabilities |  |  |  |
Accrued expenses |  | (0.6) |  |
Billings in excess of costs and earnings on uncompleted contracts |  | 1.8 |  |
Stockholders’ equity: |  |  |  |
Accumulated deficit |  | $ (0.2) |  |

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