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EARNINGS PER SHARE - Schedule of Antidilutive Securities(Tables)
 9 Months Ended
Sep. 27, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]  
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 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