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EARNINGS PER SHARE - Schedule of Antidilutive Securities(Tables) | 9 Months Ended
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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 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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