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EARNINGS PER SHARE - Antidilutive Securities (Details) - shares | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2017 | Sep. 28, 2016 | Sep. 27, 2017 | Sep. 28, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Document period end date |  |  | Sep. 27, 2017 |
Common stock | Stock options |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive shares (in shares) | 18,676 | 0 | 18,676 | 0
Common stock | Performance stock units |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive shares (in shares) | 86,396 | 62,800 | 86,396 | 62,800
Common stock | Shares of Class B common stock |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive shares (in shares) | 10,567,792 | 11,754,078 | 10,567,792 | 11,754,078

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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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