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NON-CONTROLLING INTERESTS - Schedule of Non-Controlling Interest (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 26, 2018 | Sep. 26, 2018 | Jun. 27, 2018 | Mar. 28, 2018 | Dec. 27, 2017 | Sep. 27, 2017 | Jun. 28, 2017 | Mar. 29, 2017 | Dec. 26, 2018 | Dec. 27, 2017 | Dec. 28, 2016
Noncontrolling Interest [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to Shake Shack Inc. | $ (958) | $ 5,025 | $ 7,604 | $ 3,508 | $ (12,463) | $ 4,997 | $ 4,879 | $ 2,267 | $ 15,179 | $ (320) | $ 12,446
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) on available-for-sale securities |  |  |  |  |  |  |  |  | 13 | (47) | (16)
Total effect of changes in ownership interest on equity attributable to Shake Shack Inc. |  |  |  |  |  |  |  |  | 32,900 | 8,512 | 30,247
Unrealized holding gains (losses) on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |
Unrealized holding gains (losses) on available-for-sale securities |  |  |  |  |  |  |  |  | 10 | (34) | (10)
Stock options |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |
Transfers (to) from non-controlling interests |  |  |  |  |  |  |  |  | 2,509 | 4,451 | 825
Increase in additional paid-in capital as a result of the redemption of LLC Interests |  |  |  |  |  |  |  |  |  |  |
Other comprehensive loss: |  |  |  |  |  |  |  |  |  |  |
Transfers (to) from non-controlling interests |  |  |  |  |  |  |  |  | $ 15,202 | $ 4,415 | $ 16,986

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