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Organization and Summary of Significant Accounting Policies - Operating Income from Continuing Operations (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
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues | $ 164.4 | $ 159.4 | $ 151.2 | $ 143.0 | $ 166.3 | $ 157.1 | $ 147.9 | $ 132.0 | $ 618.0 | $ 603.3 | $ 541.9
Total costs |  |  |  |  |  |  |  |  | 448.3 | 445.7 | 421.4
Gross profit | 45.5 | 44.1 | 39.3 | 40.8 | 46.8 | 37.2 | 37.5 | 36.1 | 169.7 | 157.6 | 120.5
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 119.8 | 127.3 | 114.6
Operating income from continuing operations | $ 10.8 | $ 10.1 | $ 2.6 | $ 7.0 | $ (15.0) | $ 0.1 | $ 1.5 | $ 1.4 | 30.5 | (12.0) | (18.0)
Service |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 200.7 | 197.8 | 221.3
Total costs |  |  |  |  |  |  |  |  | 137.8 | 138.6 | 162.1
Product |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 417.3 | 405.5 | 320.6
Total costs |  |  |  |  |  |  |  |  | 310.5 | $ 307.1 | $ 259.3
Balances Without Adoption of ASC 606 | ASC 606 |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 588.0 |  |
Total costs |  |  |  |  |  |  |  |  | 426.4 |  |
Gross profit |  |  |  |  |  |  |  |  | 161.6 |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 119.8 |  |
Operating income from continuing operations |  |  |  |  |  |  |  |  | 22.4 |  |
Balances Without Adoption of ASC 606 | ASC 606 | Service |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 200.7 |  |
Total costs |  |  |  |  |  |  |  |  | 137.8 |  |
Balances Without Adoption of ASC 606 | ASC 606 | Product |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 387.3 |  |
Total costs |  |  |  |  |  |  |  |  | 288.6 |  |
Effect of Change Higher/(Lower) |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 30.0 |  |
Effect of Change Higher/(Lower) | ASC 606 |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 30.0 |  |
Total costs |  |  |  |  |  |  |  |  | 21.9 |  |
Gross profit |  |  |  |  |  |  |  |  | 8.1 |  |
Selling, general and administrative expenses |  |  |  |  |  |  |  |  | 0.0 |  |
Operating income from continuing operations |  |  |  |  |  |  |  |  | 8.1 |  |
Effect of Change Higher/(Lower) | ASC 606 | Service |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 0.0 |  |
Total costs |  |  |  |  |  |  |  |  | 0.0 |  |
Effect of Change Higher/(Lower) | ASC 606 | Product |  |  |  |  |  |  |  |  |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 30.0 |  |
Total costs |  |  |  |  |  |  |  |  | $ 21.9 |  |

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