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Stockholders' Equity - Summary of Changes in Stockholders' Equity (Details) - USD ($) $ in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Apr. 01, 2018 | Mar. 26, 2017 | Dec. 31, 2017 | Dec. 25, 2016
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Stockholders’ equity at beginning of period | $ 511.5 | $ 276.4 |  |
Comprehensive loss: |  |  |  |
Net loss | (2.2) | (10.0) |  |
Change in cumulative translation adjustment | (0.1) | 0.1 |  |
Comprehensive loss | (2.3) | (9.9) |  |
Stock-based compensation | 1.7 | 2.1 |  |
Issuance of common stock for cash | 0.0 | 81.9 |  |
Issuance of common stock for employee stock purchase plan | 1.8 | 1.4 |  |
Restricted stock units exchanged for taxes | 0.0 | (0.5) |  |
Stockholders’ equity at end of period | $ 512.5 | $ 351.4 |  |
ASC 606 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Impact from adoption of ASC 606 (Note 1) |  |  | $ (0.2) | $ 0.0

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e557-108580 + Details
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