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NON-CONTROLLING INTERESTS - Changes in Ownership Interests in SSE Holdings (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 25, 2020
Noncontrolling Interest [Line Items] |  |
Net income (loss) attributable to Shake Shack Inc. | $ 1,309 | $ (960)
Other comprehensive income: |  |
Net change related to available-for-sale securities | (1) | 1
Transfers (to) from non-controlling interests: |  |
Total effect of changes in ownership interest on equity attributable to Shake Shack Inc. | 4,704 | (341)
Redemption or Exchange of Units |  |
Transfers (to) from non-controlling interests: |  |
Increase (decrease) in additional paid-in capital | 36 | 195
Employee Stock Option |  |
Transfers (to) from non-controlling interests: |  |
Increase (decrease) in additional paid-in capital | $ 3,359 | $ 424

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