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NON-CONTROLLING INTERESTS - Ownership Interest in SSE Holdings (Details) - shares | Sep. 27, 2017 | Dec. 28, 2016
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Noncontrolling Interest [Abstract] |  |
Number of LLC Interests held by Shake Shack Inc. (in shares) | 26,161,111 | 25,151,384
Number of LLC Interests held by Shake Shack Inc. (as a percentage) | 71.20% | 69.10%
Number of LLC Interests held by non-controlling interest holders (in shares) | 10,567,792 | 11,253,592
Number of LLC Interests held by non-controlling interest holders (as a percentage) | 28.80% | 30.90%
Total LLC Interests outstanding (in shares) | 36,728,903 | 36,404,976
Total LLC Interests outstanding (as a percentage) | 100.00% | 100.00%

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- 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

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

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

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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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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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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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Data Type: | num:percentItemType
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- References No definition available. + Details
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Balance Type: | na
Period Type: | duration