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EARNINGS PER SHARE (Tables)
 12 Months Ended
Dec. 26, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share
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
Schedule of Antidilutive Securities
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.