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EQUITY-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 26, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Equity-Based Compensation Expense Recognized | A summary of equity-based compensation expense recognized during fiscal 2018, 2017 and 2016 is as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
Stock options | 3,039 |  |  | 3,474 |  |  | 4,262 |
Performance stock units | 2,449 |  |  | 1,869 |  |  | 1,092 |
Restricted stock units | 655 |  |  | 280 |  |  | — |
Equity-based compensation expense | $ | 6,143 |  |  | $ | 5,623 |  |  | $ | 5,354 |
Total income tax benefit recognized related to equity-based compensation | $ | 172 |  |  | $ | 198 |  |  | $ | 168 |
Equity-based compensation expense is allocated to general and administrative expenses and labor and related expenses on the Consolidated Statements of Income (Loss) during fiscal 2018, 2017 and 2016 as follows:
|  | 2018 |  |  | 2017 |  |  | 2016 |
General and administrative expenses | 5,991 |  |  | 5,463 |  |  | 5,260 |
Labor and related expenses | 152 |  |  | 160 |  |  | 94 |
Equity-based compensation expense | 6,143 |  |  | 5,623 |  |  | 5,354 |
Schedule of Fair Value of Stock Options | The fair value of stock option awards was determined on the grant date using the Black-Scholes valuation model based on the following weighted-average assumptions:
| 2018 |  |  | 2017 |  |  | 2016 |
Expected term (years)(1) | 7.5 |  |  | 7.5 |  |  | 5.5 |
Expected volatility(2) | 42.5 | % |  | 44.5 | % |  | 50.7 | %
Risk-free interest rate(3) | 2.8 | % |  | 2.1 | % |  | 1.5 | %
Dividend yield(4) | — | % |  | — | % |  | — | %
(1) | Expected term represents the estimated period of time until an award is exercised and was determined using the simplified method.
(2) | Expected volatility is based on the historical volatility of a selected peer group over a period equivalent to the expected term.
(3) | The risk-free rate rate is an interpolation of yields on U.S. Treasury securities with maturities equivalent to the expected term.
(4) | We have assumed a dividend yield of zero as we have no plans to declare dividends in the foreseeable future.
Schedule of Stock Options, Activity | A summary of stock option activity for fiscal years 2018, 2017 and 2016 is as follows:
|  | Stock Options |  |  | Weighted Average Exercise Price |  |  | Aggregate Intrinsic Value |  |  | Weighted Average Remaining Contractual Life (Years)
Outstanding as of December 30, 2015 | 2,574,981 |  |  | $ | 21.00 |  |  |  |  |
| Granted | 16,931 |  |  | 34.74 |  |  |  |  |
| Exercised | (160,230 | ) |  | 21.00 |  |  |  |  |
| Forfeited | (66,960 | ) |  | (21.00 | ) |  |  |  |
| Expired | — |  |  | — |  |  |  |  |
Outstanding as of December 28, 2016 | 2,364,722 |  |  | $ | 21.10 |  |  |  |  |
| Granted | 5,150 |  |  | 38.91 |  |  |  |  |
| Exercised | (359,011 | ) |  | 21.13 |  |  |  |  |
| Forfeited | (291,520 | ) |  | (21.00 | ) |  |  |  |
| Expired | — |  |  | — |  |  |  |  |
Outstanding as of December 27, 2017 | 1,719,341 |  |  | $ | 21.16 |  |  |  |  |
| Granted | 5,036 |  |  | 39.91 |  |  |  |  |
| Exercised | (260,515 | ) |  | 21.00 |  |  |  |  |
| Forfeited | (102,879 | ) |  | (21.27 | ) |  |  |  |
| Expired | — |  |  | — |  |  |  |  |
Outstanding as of December 26, 2018 | 1,360,983 |  |  | $ | 21.25 |  |  | $ | 29,881 |  |  | 6.1
Options vested and exercisable as of December 26, 2018 | 674,247 |  |  | $ | 21.26 |  |  | $ | 14,798 |  |  | 6.1
Options expected to vest as of December 26, 2018 | 686,736 |  |  | $ | 21.25 |  |  | $ | 15,083 |  |  | 6.1
Schedule of Nonvested Share Activity | As of December 26, 2018, total unrecognized compensation expense related to unvested stock options was $3,335
Schedule of Information About Stock Options | The following table summarizes information about stock options outstanding and exercisable as December 26, 2018:
|  | Options Outstanding |  |  | Options Exercisable |
|  | Number Outstanding at December 26, 2018 |  |  | Weighted Average Remaining Contractual Life (Years) |  | Weighted Average Exercise Price |  |  | Number Exercisable at December 26, 2018 |  |  | Weighted Average Remaining Contractual Life (Years) |  |  | Weighted Average Exercise Price |
Exercise Price |  |  |  |  |  |
$21.00 |  | 1,339,274 |  |  | 6.1 |  | $ | 21.00 |  |  | 661,694 |  |  | 6.1 |  |  | $ | 21.00 |
$34.62 |  | 10,415 |  |  | 7.4 |  | $ | 34.62 |  |  | 10,415 |  |  | 7.4 |  |  | $ | 34.62 |
$36.41 |  | 1,108 |  |  | 7.9 |  | $ | 36.41 |  |  | 1,108 |  |  | 7.9 |  |  | $ | 36.41 |
$38.91 |  | 5,150 |  |  | 8.5 |  | $ | 38.91 |  |  | 1,030 |  |  | 8.5 |  |  | $ | 38.91 |
$39.91 |  | 5,036 |  |  | 9.2 |  | $ | 39.91 |  |  | — |  |  | — |  |  | $ | — |
Schedule of Stock Options Outstanding and Exercisable, Option Plans | A summary of performance stock unit activity for fiscal years 2018, 2017 and 2016 is as follows:
|  | Performance Stock Units |  |  | Weighted Average Grant Date Fair Value |
Outstanding as of December 30, 2015 | — |  |  | $ | — |
| Granted | 63,600 |  |  | 38.41 |
| Performance achievement(1) | — |  |  | — |
| Vested | — |  |  | — |
| Forfeited | (2,000 | ) |  | 38.43 |
| Expired | — |  |  | — |
Outstanding as of December 28, 2016 | 61,600 |  |  | $ | 38.41 |
| Granted | 87,596 |  |  | 37.90 |
| Performance achievement(1) | 9,545 |  |  | 38.40 |
| Vested | (22,703 | ) |  | 38.40 |
| Forfeited | (11,196 | ) |  | 38.28 |
| Expired | — |  |  | — |
Outstanding as of December 27, 2017 | 124,842 |  |  | $ | 38.06 |
| Granted | 60,437 |  |  | 58.46 |
| Performance achievement(1) | (12,139 | ) |  | 37.89 |
| Vested | (43,861 | ) |  | 38.13 |
| Forfeited | (10,737 | ) |  | 41.28 |
| Expired | — |  |  | — |
Outstanding as of December 26, 2018 | 118,542 |  |  | $ | 48.16 |
(1) | Represents the incremental awards earned and/or awards forfeited based on the achievement of performance conditions

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