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NON-CONTROLLING INTERESTS - Changes in Ownership Interests in SSE Holdings (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 23, 2020 | Sep. 25, 2019 | Sep. 23, 2020 | Sep. 25, 2019
Noncontrolling Interest [Line Items] |  |  |  |
Net income (loss) attributable to Shake Shack Inc. | $ (5,559) | $ 10,344 | $ (22,730) | $ 21,920
Other comprehensive income: |  |  |  |
Net change related to available-for-sale securities | 0 | 0 | 1 | 0
Transfers (to) from non-controlling interests: |  |  |  |
Total effect of changes in ownership interest on equity attributable to Shake Shack Inc. | (5,148) | 32,985 | 113,854 | 50,971
Redemption or Exchange of Units |  |  |  |
Transfers (to) from non-controlling interests: |  |  |  |
Increase (decrease) in additional paid-in capital | 44 | 1,634 | 239 | 7,115
Employee Stock Option |  |  |  |
Transfers (to) from non-controlling interests: |  |  |  |
Increase (decrease) in additional paid-in capital | 367 | 1,789 | 627 | 2,718
Common Stock [Member] | Class A Common Stock |  |  |  |
Transfers (to) from non-controlling interests: |  |  |  |
Increase (decrease) in additional paid-in capital | 0 | 0 | 135,718 | 0
Additional Paid-In Capital | Gramercy Tavern Merger |  |  |  |
Transfers (to) from non-controlling interests: |  |  |  |
Increase (decrease) in additional paid-in capital | $ 0 | $ 19,218 | $ 0 | $ 19,218

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