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EQUITY-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2015 | Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016 | Dec. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity based compensation |  | $ 107 | $ 109 | $ 139 |
Equity-based compensation expense |  | 6,143 | 5,623 | 5,354 |
Proceeds from stock option exercises |  | 5,472 | 7,585 | 3,194 |
Restricted Class B units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity-based compensation expense |  | 655 | $ 280 | 0 |
Stock options outstanding (in shares) |  |  | 0 |  |
Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity-based compensation expense |  | 3,039 | $ 3,474 | 4,262 |
Fair value vested |  | 3,483 | 4,458 | 4,678 |
Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Equity-based compensation expense |  | $ 2,449 | $ 1,869 | $ 1,092 |
2015 Incentive Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares available for grant (in shares) | 5,865,522 |  |  |  |
2015 Incentive Award Plan | Minimum | Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 1 year |  |  |  |
2015 Incentive Award Plan | Maximum | Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period | 5 years |  |  |  |
Unit Appreciation Rights Plan | Unit appreciation rights |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options outstanding (in shares) |  |  | 0 |  |
2015 Incentive Award Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options outstanding (in shares) |  | 1,360,983 | 1,719,341 | 2,364,722 | 2,574,981
Unrecognized compensation expense |  | $ 3,335 |  |  |
Weighted-average period for recognition compensation expense |  | 1 year 2 months 20 days |  |  |
Intrinsic value of stock options exercised |  | $ 14,798 |  |  |
Stock option exercises (in shares) |  | 260,515 | 359,011 | 160,230 |
Proceeds from stock option exercises |  | $ 5,472 |  |  |
2015 Incentive Award Plan | Restricted Class B units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Performance shares granted (in shares) |  | 49,723 | 44,476 | 0 |
Granted (in shares) |  | 18,882 | 44,476 | 0 |
Granted (in USD per share) |  | $ 49.12 | $ 38.98 |  |
2015 Incentive Award Plan | Stock options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Intrinsic value of stock options exercised |  | $ 5,786 | $ 8,333 | $ 2,536 |
Vested (in shares) |  | (404,120) | (503,686) | (562,296) |
2015 Incentive Award Plan | Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  | 3 years |  |  |
Weighted-average period for recognition compensation expense |  | 2 years 1 month 26 days |  |  |
Performance period |  | 1 year |  |  |
Performance shares granted (in shares) |  | 118,542 | 124,842 | 61,600 | 0
Shares expected to be recognized |  | $ 2,954 |  |  |
Granted (in shares) |  | 60,437 | 87,596 | 63,600 |
Granted (in USD per share) |  | $ 58.46 | $ 37.90 | $ 38.41 |
Issuance of common stock in settlement of unit appreciation rights |  | $ 1,726 |  |  |
Weighted average period |  | 3 years 6 months 10 days |  |  |
2015 Incentive Award Plan | Minimum | Restricted Class B units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  | 1 year |  |  |
2015 Incentive Award Plan | Minimum | Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Range of awards |  | 0.00% |  |  |
2015 Incentive Award Plan | Maximum | Restricted Class B units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  | 5 years |  |  |
2015 Incentive Award Plan | Maximum | Performance Shares |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Range of awards |  | 125.00% |  |  |

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