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Organization and Summary of Significant Accounting Policies - Balance Sheet (Details) - USD ($) $ in Millions | Dec. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Assets |  |  |
Accounts receivable, net | $ 64.6 |  | $ 74.2
Unbilled receivables, net | 172.8 |  | 138.1
Inventoried costs | 46.8 |  | 49.0
Liabilities |  |  |
Accrued expenses | 38.1 |  | 40.9
Billings in excess of costs and earnings on uncompleted contracts | 34.9 |  | 42.8
Stockholders’ equity: |  |  |
Accumulated deficit | 724.5 |  | $ 720.8
ASC 606 |  |  |
Assets |  |  |
Unbilled receivables, 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 | 66.5 |  |
Unbilled receivables, net | 148.1 |  |
Inventoried costs | 68.7 |  |
Liabilities |  |  |
Billings in excess of costs and earnings on uncompleted contracts | 42.1 |  |
Stockholders’ equity: |  |  |
Accumulated deficit | 732.6 |  |
ASC 606 | Effect of Change Higher/(Lower) |  |  |
Assets |  |  |
Accounts receivable, net | (1.9) |  |
Unbilled receivables, net | 24.7 |  |
Inventoried costs | (21.9) |  |
Liabilities |  |  |
Billings in excess of costs and earnings on uncompleted contracts | (7.2) |  |
Stockholders’ equity: |  |  |
Accumulated deficit | $ (8.1) |  |
Balance at January 1, 2018 | ASC 606 |  |  |
Assets |  |  |
Unbilled receivables, 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 receivables, 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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