CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 24, 2020	Jun. 30, 2021	Jun. 24, 2020
Statement of Comprehensive Income [Abstract]
Net income (loss) attributable to Shake Shack Inc.—basic	$ 2,065	$ (18,031)	$ 2,640	$ (19,110)
Other comprehensive income (loss), net of tax(1):
Change in foreign currency translation adjustment	0	0	(1)	1
Net change	0	0	(1)	1
OTHER COMPREHENSIVE INCOME (LOSS)	0	0	(1)	1
COMPREHENSIVE INCOME (LOSS)	2,065	(18,031)	2,639	(19,109)
Less: comprehensive income (loss) attributable to non-controlling interest	121	(1,820)	(613)	(1,939)
COMPREHENSIVE INCOME (LOSS) ATTRIBUTABLE TO SHAKE SHACK INC.	$ 1,944	$ (16,211)	$ 3,252	$ (17,170)