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Organization and Summary of Significant Accounting Policies - Revenue Recognition - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 30, 2018 | Sep. 30, 2018 | Jul. 01, 2018 | Apr. 01, 2018 | Dec. 31, 2017 | Oct. 01, 2017 | Jun. 25, 2017 | Mar. 26, 2017 | Dec. 30, 2018 | Dec. 31, 2017 | Dec. 25, 2016 | Jan. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ 724.5 |  |  |  | $ 720.8 |  |  |  | $ 724.5 | $ 720.8 |  |
Revenue | 164.4 | $ 159.4 | $ 151.2 | $ 143.0 | 166.3 | $ 157.1 | $ 147.9 | $ 132.0 | 618.0 | 603.3 | $ 541.9 |
Remaining performance obligation | 620.7 |  |  |  |  |  |  |  | 620.7 |  |  |
Provision for loss on contracts | 5.1 |  |  |  | 10.3 |  |  |  | 5.1 | 10.3 |  |
Contract assets, Net change |  |  |  |  |  |  |  |  | 33.5 |  |  |
Contract liabilities, Net change |  |  |  |  |  |  |  |  | (9.8) |  |  |
Revenue recognized |  |  |  |  |  |  |  |  | 35.5 |  |  |
Unbilled |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable | 3.8 |  |  |  | $ 1.9 |  |  |  | 3.8 | $ 1.9 |  |
Effect of Change Higher/(Lower) |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 30.0 |  |  |
Cost of revenue |  |  |  |  |  |  |  |  | 21.9 |  |  |
ASC 606 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  |  |  |  |  |  | $ 721.0
ASC 606 | Effect of Change Higher/(Lower) |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit | $ (8.1) |  |  |  |  |  |  |  | (8.1) |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 30.0 |  |  |
ASC 606 Adjustment | ASC 606 |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Accumulated deficit |  |  |  |  |  |  |  |  |  |  |  | $ 0.2

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