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EARNINGS PER SHARE | 3 Months Ended
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Mar. 31, 2021
Earnings Per Share [Abstract] |
EARNINGS PER SHARE | EARNINGS (LOSS) PER SHAREThe following table sets forth reconciliations of the numerators and denominators used to compute basic and diluted earnings (loss) per share of Class A common stock (in thousands, except per share amounts) for the thirteen weeks ended March 31, 2021 and March 25, 2020.
|  |  | Thirteen Weeks Ended |  |
|  |  | March 31 2021 |  | March 25 2020 |  |  |  |
Numerator: |  |  |  |  |  |  |
| Net income (loss) attributable to Shake Shack Inc.—basic | $ | 1,309 |  |  | $ | (960) |  |  |  |  |
| Reallocation of net loss attributable to non-controlling interests from the assumed conversion of Class B shares | (734) |  |  | — |  |  |  |  |
| Net income (loss) attributable to Shake Shack Inc.—diluted | $ | 575 |  |  | $ | (960) |  |  |  |  |
Denominator: |  |  |  |  |  |  |
| Weighted-average shares of Class A common stock outstanding—basic | 38,948 |  |  | 34,444 |  |  |  |  |
| Effect of dilutive securities: |  |  |  |  |  |  |
|  | Stock options | 232 |  |  | — |  |  |  |  |
|  | Performance stock units | 53 |  |  | — |  |  |  |  |
|  | Restricted stock units | 164 |  |  | — |  |  |  |  |
|  | Convertible Notes | 451 |  |  | — |  |  |  |  |
|  | Shares of Class B common stock | 2,941 |  |  | — |  |  |  |  |
| Weighted-average shares of Class A common stock outstanding—diluted | 42,789 |  |  | 34,444 |  |  |  |  |
Earnings (loss) per share of Class A common stock—basic | $ | 0.03 |  |  | $ | (0.03) |  |  |  |  |
Earnings (loss) per share of Class A common stock—diluted | $ | 0.01 |  |  | $ | (0.03) |  |  |  |  |
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 (loss) per share of Class B common stock under the two-class method has not been presented. However, shares of our Class B common stock outstanding for the period are considered potentially dilutive shares of Class A common stock under application of the if-converted method and are included in the computation of diluted earnings (loss) per share, except when the effect would be antidilutive. The following table presents potentially dilutive securities, as of the end of the period, excluded from the computations of diluted earnings (loss) per share of Class A common stock for the thirteen weeks ended March 31, 2021 and March 25, 2020.
| Thirteen Weeks Ended |  |
| March 31 2021 |  | March 25 2020 |  |  |  |  |  |
Stock options | 1,698 |  | (1) | 847,207 |  | (3) |  |  |  |  |
Performance stock units | 51,974 |  | (2) | 179,253 |  | (3) |  |  |  |  |
Restricted stock units | — |  |  | 264,431 |  | (3) |  |  |  |  |
Shares of Class B common stock | — |  |  | 3,117,002 |  | (3) |  |  |  |  |
(1) Number of securities outstanding at the end of the period that were excluded from the computation of diluted earnings (loss) 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) Number of securities outstanding at the end of the period that were excluded from the computation of diluted earnings (loss) per share of Class A common stock because the performance conditions associated with these awards were not met assuming the end of the reporting period was the end of the performance period. (3) Number of securities outstanding at the end of the period that were excluded from the computation of diluted earnings (loss) per share of Class A common stock because the effect would have been anti-dilutive.

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