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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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