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EQUITY-BASED COMPENSATION - Schedule of Stock Options (Details) - 2015 Incentive Award Plan - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016
Stock Options |  |  |
Outstanding at beginning of period (in shares) | 1,719,341 | 2,364,722 | 2,574,981
Granted (in shares) | 5,036 | 5,150 | 16,931
Exercised (in shares) | (260,515) | (359,011) | (160,230)
Forfeited (in shares) | (102,879) | (291,520) | (66,960)
Expired (in shares) | 0 | 0 | 0
Outstanding at end of period (in shares) | 1,360,983 | 1,719,341 | 2,364,722
Options vested and exercisable at end of period (in shares) | 674,247 |  |
Options expected to vest (in shares) | 686,736 |  |
Weighted Average Exercise Price |  |  |
Outstanding at beginning of period (in USD per share) | $ 21.16 | $ 21.10 | $ 21.00
Granted (in USD per share) | 39.91 | 38.91 | 34.74
Exercised (in USD per share) | 21.00 | 21.13 | 21.00
Forfeited (in USD per share) | (21.27) | (21.00) | (21.00)
Expired (in USD per share) | 0.00 | 0.00 | 0.00
Outstanding at end of period (in USD per share) | 21.25 | $ 21.16 | $ 21.10
Weighted average options vested and exercisable (in USD per share) | 21.26 |  |
Options expected to vest (in USD per share) | $ 21.25 |  |
Aggregate Intrinsic Value |  |  |
Outstanding at end of period | $ 29,881 |  |
Options exercised during period | 14,798 |  |
Options expected to vest as of December 26, 2018 | $ 15,083 |  |
Weighted Average Remaining Contractual Life (Years) |  |  |
Outstanding at end of period | 6 years 1 month 14 days |  |
Options exercisable at end of year | 6 years 1 month 12 days |  |
Options expected to vest at end of year | 6 years 1 month 16 days |  |
Stock options |  |  |
Stock Options |  |  |
Nonvested beginning balance (in shares) | 1,176,095 | 1,964,251 | 2,574,981
Granted (in shares) | 5,036 | 5,150 | 16,931
Vested (in shares) | (404,120) | (503,686) | (562,296)
Forfeited (in shares) | (90,275) | (289,620) | (65,365)
Nonvested ending balance (in shares) | 686,736 | 1,176,095 | 1,964,251
Weighted Average Exercise Price |  |  |
Nonvested, beginning balance (in USD per share) | $ 8.64 | $ 8.66 | $ 8.53
Granted (in USD per share) | 19.86 | 19.42 | 16.32
Vested (in USD per share) | 8.62 | 8.85 | 8.32
Forfeited (in USD per share) | 8.59 | 8.59 | 8.59
Nonvested, ending balance (in USD per share) | $ 8.74 | $ 8.64 | $ 8.66
Aggregate Intrinsic Value |  |  |
Options exercised during period | $ 5,786 | $ 8,333 | $ 2,536

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