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STOCK-BASED COMPENSATION (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Jul. 02, 2015 USD ($) | Mar. 31, 2016 USD ($) plan shares | Dec. 31, 2015 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Share-based compensation arrangement by share-based payment award, number of plans | plan |  | 3 |
Grants in period, net of forfeitures (in shares) | shares |  | 111,662 |
Requisite service periods of awards, in years |  | 3 years |
Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options exercisable, vesting period, in years |  | 4 years |
Total unrecognized compensation costs |  | $ 4.2 |
Weighted-average period for cost recognition, in years |  | 2 years |
Restricted stock awards/stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock options exercisable, vesting period, in years |  | 3 years |
Total unrecognized compensation costs |  | $ 23.7 |
Weighted-average period for cost recognition, in years |  | 2 years |
Awards granted during period | shares |  | 124,123 |
Performance shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Awards granted during period | shares |  | 78,177 |
SeaSpine Inc. | Spinoff |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Incremental increase in stock based award expense after spinoff | $ 4.4 | $ 0.2 | $ 3.3
Total unrecognized compensation costs |  | $ 0.9 |
Employee | Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period, in years |  | 8 years |
Directors and certain executive officers | Minimum | Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period, in years |  | 8 years |
Directors and certain executive officers | Maximum | Stock options |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period, in years |  | 10 years |

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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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