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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Jan. 01, 2017 | Dec. 25, 2015 | May 11, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock-based compensation expense | $ 7.7 | $ 9.4 | $ 11.1 |
Granted (in dollars per share) | $ 25.45 | $ 21.53 | $ 23.03 |
Number of common stock shares represented by each performance share (in shares) | 1 |  |  |
Tax benefit from compensation expense | $ 2.7 | $ 3.3 | $ 3.9 |
Restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Compensation not yet recognized | $ 11.9 |  |  |
Unrecognized stock-based compensation expense, period for recognition | 1 year 8 months 1 day |  |  |
Vested in Period, fair value | $ 6.9 | 6.6 | 6.2 |
Restricted stock | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 3 years |  |  |
Restricted stock | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 4 years |  |  |
Performance shares |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Vesting period | 3 years |  |  |
Compensation not yet recognized | $ 2.1 |  |  |
Unrecognized stock-based compensation expense, period for recognition | 1 year 11 months 30 days |  |  |
Vested in Period, fair value | $ 2.9 | $ 3.3 | $ 4.0 |
Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Option expiration period | 7 years |  |  |
Employee stock purchase plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
ESPP shares reserved for purchase (in shares) | 1,000,000 |  |  |
Maximum employee subscription rate | 10.00% |  |  |
Purchase price of common stock, percent of market value | 85.00% |  |  |
Employee stock purchase plan requisite service period | 1 month |  |  |
Incentive Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Shares authorized for issuance (in shares) |  |  |  | 1,540,000

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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