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RELATED PARTY TRANSACTIONS - Tax Receivable Agreement (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2025 | Dec. 25, 2024 | Dec. 27, 2023
Related Party Transactions [Abstract] |  |  |
Amounts paid under the Tax Receivable Agreement | $ 37,000 | $ 0 | $ 0
Amounts due under the Tax Receivable Agreement | $ 246,835,000 | $ 247,734,000 |

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- Definition Tax Receivable Agreement Liability, Current and Noncurrent + References No definition available. + Details
Name: | shak_TaxReceivableAgreementLiabilityCurrentandNoncurrent
Namespace Prefix: | shak_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Tax receivable agreement payments to related parties. + References No definition available. + Details
Name: | shak_TaxReceivableAgreementPaymentsToRelatedParties
Namespace Prefix: | shak_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration