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LEASES - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 26, 2018 USD ($) lease | Dec. 27, 2017 USD ($) lease | Dec. 28, 2016 USD ($)
Leases [Abstract] |  |  |
Number of sale leaseback transactions, accounting owner | lease | 24 | 23 |
Common area maintenance costs, real estate taxes, and other occocupancy costs not included in rent expense | $ | $ 6,479 | $ 4,570 | $ 3,229
Number of sale leaseback transactions | lease | 1 | 11 |
Deemed landlord financing | $ | $ 20,846 | $ 14,518 |

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- Definition 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. + References No definition available. + Details
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- Definition Number of sale leaseback transactions + References No definition available. + Details
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- Definition Number of Sale Leaseback Transactions, Accounting Owner + References No definition available. + Details
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- Definition Operating Leases, Maintenance Costs, Real Estate Taxes, and Other Occupancy Costs + References No definition available. + Details
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Namespace Prefix: | shak_
Data Type: | xbrli:monetaryItemType
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- References No definition available. + Details
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