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EARNINGS PER SHARE | 9 Months Ended
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Sep. 27, 2017
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 available 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 available 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 the thirteen and thirty-nine weeks ended September 27, 2017 and September 28, 2016.
|  |  | Thirteen Weeks Ended |  |  | Thirty-Nine Weeks Ended |
|  |  | September 27 2017 |  |  | September 28 2016 |  |  | September 27 2017 |  |  | September 28 2016 |
Numerator: |  |  |  |  |  |  |
| Net income | $ | 7,870 |  |  | $ | 6,789 |  |  | $ | 19,916 |  |  | $ | 16,689 |
| Less: net income attributable to non-controlling interests | 2,873 |  |  | 3,023 |  |  | 7,773 |  |  | 8,163 |
| Net income attributable to Shake Shack Inc. | $ | 4,997 |  |  | $ | 3,766 |  |  | $ | 12,143 |  |  | $ | 8,526 |
Denominator: |  |  |  |  |  |  |
| Weighted-average shares of Class A common stock outstanding—basic | 26,024 |  |  | 24,023 |  |  | 25,733 |  |  | 22,310 |
| Effect of dilutive securities: |  |  |  |  |  |  |
|  | Stock options | 411 |  |  | 531 |  |  | 486 |  |  | 495 |
|  | Performance stock units | 26 |  |  | — |  |  | 24 |  |  | — |
|  | Restricted stock units | 16 |  |  | — |  |  | 5 |  |  | — |
| Weighted-average shares of Class A common stock outstanding—diluted | 26,477 |  |  | 24,554 |  |  | 26,248 |  |  | 22,805 |
Earnings per share of Class A common stock—basic | $ | 0.19 |  |  | $ | 0.16 |  |  | $ | 0.47 |  |  | $ | 0.38 |
Earnings per share of Class A common stock—diluted | $ | 0.19 |  |  | $ | 0.15 |  |  | $ | 0.46 |  |  | $ | 0.37 |
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 the thirteen and thirty-nine weeks ended September 27, 2017 and September 28, 2016.
|  |  | Thirteen Weeks Ended |  | Thirty-Nine Weeks Ended
|  |  | September 27 2017 |  |  |  | September 28 2016 |  |  |  | September 27 2017 |  |  |  | September 28 2016 |  |
Stock options(1) | 18,676 |  | (2) |  | — |  |  |  | 18,676 |  | (2) |  | — |  |
Performance stock units(1) | 86,396 |  | (3) |  | 62,800 |  | (3) |  | 86,396 |  | (3) |  | 62,800 |  | (3)
Shares of Class B common stock | 10,567,792 |  | (4) |  | 11,754,078 |  | (4) |  | 10,567,792 |  | (4) |  | 11,754,078 |  | (4)
(1) | Represents the number of instruments outstanding at the end of the period. Application of the treasury stock method would reduce this amount if they had a dilutive effect and were included in the computation of diluted earnings per share.
(2) | 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").
(3) | Excluded from the computation of diluted earnings 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.
(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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -URI http://asc.fasb.org/topic&trid=2144383 + Details
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