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EARNINGS PER SHARE | 12 Months Ended
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Dec. 26, 2018
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | EARNINGS PER SHARE
Basic earnings per share of Class A common stock is computed by dividing net income attributable to Shake Shack Inc. by the weighted-average number of shares of Class A common stock outstanding during the period. Diluted earnings per share of Class A common stock is computed by dividing net income attributable to Shake Shack Inc. by the weighted-average number of shares of Class A common stock outstanding adjusted to give effect to potentially dilutive securities. The following table sets forth reconciliations of the numerators and denominators used to compute basic and diluted earnings per share of Class A common stock for fiscal 2018, 2017 and 2016.
|  |  | 2018 |  |  | 2017 |  |  | 2016 |
Numerator: |  |  |  |  |
| Net income | $ | 21,948 |  |  | $ | 8,884 |  |  | $ | 22,146 |
| Less: net income attributable to non-controlling interests | 6,769 |  |  | 9,204 |  |  | 9,700 |
| Net income (loss) attributable to Shake Shack Inc. | $ | 15,179 |  |  | $ | (320 | ) |  | $ | 12,446 |
Denominator: |  |  |  |  |
| Weighted-average shares of Class A common stock outstanding—basic | 28,299 |  |  | 25,876 |  |  | 22,956 |
| Effect of dilutive securities: |  |  |  |  |
|  | Stock options | 798 |  |  | — |  |  | 491 |
|  | Performance stock units | 63 |  |  | — |  |  | 2 |
|  | Restricted stock units | 19 |  |  | — |  |  | — |
| Weighted-average shares of Class A common stock outstanding—diluted | 29,179 |  |  | 25,876 |  |  | 23,449 |
Earnings (loss) per share of Class A common stock—basic | $ | 0.54 |  |  | $ | (0.01 | ) |  | $ | 0.54 |
Earnings (loss) per share of Class A common stock—diluted | $ | 0.52 |  |  | $ | (0.01 | ) |  | $ | 0.53 |
Shares of our Class B common stock do not share in the earnings or losses of Shake Shack and are therefore not participating securities. As such, separate presentation of basic and diluted earnings per share of Class B common stock under the two-class method has not been presented. The following table presents potentially dilutive securities excluded from the computations of diluted earnings per share of Class A common stock for fiscal 2018, 2017 and 2016.
|  |  | 2018 |  | 2017 |  | 2016
Stock options | — |  |  |  | 1,719,341 |  | (2) |  | 125 |  | (1)
Performance stock units | 21,560 |  | (3) |  | 124,842 |  | (2) |  | 26,860 |  | (3)
Restricted stock units | — |  |  |  | 44,476 |  | (2) |  | — |  |
Shares of Class B common stock | 7,557,347 |  | (4) |  | 10,250,007 |  | (4) |  | 11,253,592 |  | (4)
(1) | Weighted-average number of securities excluded from the computation of diluted earnings per share of Class A common stock because the exercise price of the stock options exceeded the average market price of our Class A common stock during the period ("out-of-the-money").
(2) | Represents number of instruments outstanding at the end of the period that were excluded from the computation of diluted earnings per share of Class A common stock because the effect would have been anti-dilutive.
(3) | Weighted-average number of securities excluded from the computation of diluted earnings per share of Class A common stock because the performance conditions were not met for a portion of the fiscal year.
(4) | Shares of our Class B common stock are considered potentially dilutive shares of Class A common stock. Amounts have been excluded from the computations of diluted earnings per share of Class A common stock because the effect would have been anti-dilutive under the if-converted and two-class methods.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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