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NON-CONTROLLING INTERESTS - Ownership Interest in SSE Holdings (Details) - shares | Sep. 23, 2020 | Dec. 25, 2019
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Noncontrolling Interest [Line Items] |  |
Number of LLC Interests held by Shake Shack Inc. (in shares) | 38,280,102 | 34,417,302
Number of LLC Interests held by non-controlling interest holders (in shares) | 3,112,002 | 3,145,197
Total LLC Interests outstanding (in shares) | 41,392,104 | 37,562,499
Total LLC Interests outstanding (as a percentage) | 100.00% | 100.00%
Shake Shack Inc. |  |
Noncontrolling Interest [Line Items] |  |
Number of LLC Interests held by Shake Shack Inc. (as a percentage) | 92.50% | 91.60%
Non-Controlling Interest Holders |  |
Noncontrolling Interest [Line Items] |  |
Number of LLC Interests held by non-controlling interest holders (as a percentage) | 7.50% | 8.40%

X
- Definition Consolidation, Less than Wholly Owned Subsidiary, Number of Shares + References No definition available. + Details
Name: | shak_ConsolidationLessthanWhollyOwnedSubsidiaryNumberofShares
Namespace Prefix: | shak_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Consolidation, Less than Wholly Owned Subsidiary, Number of Shares Held by Noncontrolling Owners + References No definition available. + Details
Name: | shak_ConsolidationLessthanWhollyOwnedSubsidiaryNumberofSharesHeldbyNoncontrollingOwners
Namespace Prefix: | shak_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Consolidation, Less than Wholly Owned Subsidiary, Number of Shares Held by Parent + References No definition available. + Details
Name: | shak_ConsolidationLessthanWhollyOwnedSubsidiaryNumberofSharesHeldbyParent
Namespace Prefix: | shak_
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Balance Type: | na
Period Type: | instant

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- Definition Noncontrolling Interest, Total Ownership Percentage + References No definition available. + Details
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Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity. + References No definition available. + Details
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- Definition The parent entity's interest in net assets of the subsidiary, expressed as a percentage. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Details
Name: | srt_OwnershipAxis=shak_ShakeShackInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_OwnershipAxis=shak_NonControllingInterestHoldersMember
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