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DEBT - Revolving Credit Facility (Details) - Revolving Credit Facility - Line of Credit - USD ($)	3 Months Ended
	Mar. 27, 2024	Jun. 26, 2024	Dec. 27, 2023
Line of Credit Facility [Line Items]
Maximum borrowing capacity		$ 50,000,000
Incremental borrowing capacity		100,000,000
Outstanding amount under credit facility		0	$ 0
Third Amendment and Restated Credit Arrangement
Line of Credit Facility [Line Items]
Maximum borrowing capacity		15,000,000
Letters of credit outstanding		$ 3,310,000	$ 3,147,000
Minimum | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (in percent)	0.00%
Minimum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (in percent)	1.00%
Maximum | Base Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (in percent)	1.50%
Maximum | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Line of Credit Facility [Line Items]
Basis spread on variable rate (in percent)	2.50%

X

- Definition

Line of Credit Facility, Incremental Borrowing Capacity

+ References

No definition available.

+ Details

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Namespace Prefix:	shak_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair value of the amount outstanding under the credit facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 825
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 10
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482907/825-10-50-10

+ Details

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Balance Type:	credit
Period Type:	instant

X

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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X

- Details

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- Details

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- Details

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