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Loss Per Share (Narrative) (Details) - shares | 12 Months Ended
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Dec. 28, 2019 | Dec. 29, 2018 | Dec. 30, 2017
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Common shares issuable on an if-converted basis adjusted to diluted EPS | 11,333,333 |  |
Stock Options [Member] |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 3,528,899 | 2,384,249 | 2,540,189
Stock Options And Restricted Stock Units [Member] |  |  |
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items] |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 370,670 | 452,316 | 815,952

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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