LEASES - Narrative (Details) $ in Thousands	3 Months Ended	12 Months Ended
Apr. 01, 2015	Dec. 28, 2016 USD ($)	Dec. 30, 2015 USD ($)	Dec. 31, 2014 USD ($)
Leases [Abstract]
Number of sale leaseback transactions	0	8
Common area maintenance costs, real estate taxes, and other occocupancy costs not included in rent expense		$ 3,229	$ 2,119	$ 1,111
Deemed Landlord Financing Liability		$ 2,007	$ 0

Landlord contributions toward structural tenant improvements for those leases in which the Company is deemed for accounting purposes to be the owner of the asset.

No definition available.

Name:	shak_DeemedLandlordFinancingLiability
Namespace Prefix:	shak_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant