Debt Instrument, Minimum Required Liquidity

No definition available.

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

- 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

- 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_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- 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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Period Type:	duration

- Definition

Period of time between issuance and maturity of debt instrument, 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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Balance Type:	na
Period Type:	duration

- Definition

Amount of interest capitalized during the period.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Total interest costs incurred during the period and either capitalized or charged against earnings.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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Balance Type:	debit
Period Type:	duration

- 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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+ Details

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

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 230
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-Section 45
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+ Details

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Balance Type:	debit
Period Type:	duration

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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DEBT (Details) - USD ($)		1 Months Ended		3 Months Ended
DEBT (Details) - USD ($)	Feb. 04, 2015	May 31, 2020	Mar. 31, 2020	Mar. 25, 2020	Mar. 27, 2019	Dec. 25, 2019
Debt Instrument [Line Items]
Proceeds from revolving credit facility				$ 50,000,000	$ 0
Notes payable				50,000,000		$ 0
Interest costs incurred				112,000	72,000
Interest costs capitalized					$ 0
Notes payable
Debt Instrument [Line Items]
Notes payable				50,000,000
Revolving Credit Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				50,000,000
Line of Credit Facility, Incremental Borrowing Capacity				100,000,000
Third Amendment and Restated Credit Arrangement \| Line of credit
Debt Instrument [Line Items]
Term to maturity	5 years
Third Amendment and Restated Credit Arrangement \| Letter of credit \| Line of credit
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 15,000,000
Third Amendment and Restated Credit Arrangement \| Minimum \| Line of credit \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate				1.00%
Third Amendment and Restated Credit Arrangement \| Minimum \| Line of credit \| Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate					0.00%
Third Amendment and Restated Credit Arrangement \| Maximum \| Line of credit \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate				1.50%
Third Amendment and Restated Credit Arrangement \| Maximum \| Line of credit \| Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate					0.50%
Subsequent Event \| Notes payable
Debt Instrument [Line Items]
Proceeds from revolving credit facility			$ 50,000,000
Subsequent Event \| First Amendment to the Credit Agreement \| Line of credit
Debt Instrument [Line Items]
Debt instrument, minimum required liquidity		$ 25,000,000
Subsequent Event \| First Amendment to the Credit Agreement \| Minimum \| Line of credit \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate		1.00%
Subsequent Event \| First Amendment to the Credit Agreement \| Minimum \| Line of credit \| Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate		0.00%
Subsequent Event \| First Amendment to the Credit Agreement \| Maximum \| Line of credit \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate		2.50%
Subsequent Event \| First Amendment to the Credit Agreement \| Maximum \| Line of credit \| Prime rate
Debt Instrument [Line Items]
Basis spread on variable rate		1.50%