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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Leases (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 01, 2015 | Dec. 28, 2016 renewal_option
Operating Leased Assets [Line Items] |  |
Number of sale leaseback transactions | 0 | 8
Number of renewal options |  | 2
Period of renewal term |  | 5 years
Minimum |  |
Operating Leased Assets [Line Items] |  |
Terms of lease contract |  | 10 years
Maximum |  |
Operating Leased Assets [Line Items] |  |
Terms of lease contract |  | 20 years

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- Definition Lessee Leasing Arrangements, Number of Renewal Options + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Number of sale leaseback transactions + References No definition available. + Details
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Namespace Prefix: | shak_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of the lessee's leasing arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Term of the lessor's leasing arrangement renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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- Details
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- Details
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Balance Type: |
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