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EARNINGS PER SHARE
 12 Months Ended
Dec. 30, 2020
Earnings Per Share [Abstract]  
EARNINGS PER SHARE EARNINGS (LOSS) PER SHARE
Basic earnings (loss) per share of Class A common stock is computed by dividing net income (loss) attributable to Shake Shack Inc. by the weighted-average number of shares of Class A common stock outstanding during the period. Diluted earnings (loss) per share of Class A common stock is computed by dividing net income (loss) 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 (loss) per share of Class A common stock for fiscal 2020, fiscal 2019 and fiscal 2018.
202020192018
Numerator:
Net income (loss)$(45,534)$24,128 $21,948 
Less: net income (loss) attributable to non-controlling interests(3,376)4,301 6,769 
Net income (loss) attributable to Shake Shack Inc.$(42,158)$19,827 $15,179 
Denominator:
Weighted-average shares of Class A common stock outstanding—basic37,129 31,381 28,299 
Effect of dilutive securities:
Stock options— 743 798 
Performance stock units— 70 63 
Restricted stock units— 57 19 
Weighted-average shares of Class A common stock outstanding—diluted37,129 32,251 29,179 
Earnings (loss) per share of Class A common stock—basic$(1.14)$0.63 $0.54 
Earnings (loss) per share of Class A common stock—diluted$(1.14)$0.61 $0.52 
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.
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 fiscal 2020, fiscal 2019 and fiscal 2018.
202020192018
Stock options489,024 (1)946 (2)— 
Performance stock units137,221 (1)51,197 (3)21,560 (3)
Restricted stock units258,493 (1)— — 
Shares of Class B common stock2,951,188 (4)3,145,197 (4)7,557,347 (4)
(1)    Represents number of instruments 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.
(2)    Weighted-average number of securities 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").
(3)    Weighted-average number of securities 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 for a portion of the fiscal year.
(4)    Shares of our Class B common stock outstanding as of the end of the period are considered potentially dilutive shares of Class A common stock. Amounts have been excluded from the computations of diluted earnings (loss) per share of Class A common stock because the effect would have been anti-dilutive under the if-converted and two-class methods.