XML 71 R59.htm IDEA: XBRL DOCUMENT v3.20.2

NON-CONTROLLING INTERESTS - Narrative (Details) - USD ($)		3 Months Ended		9 Months Ended
	Apr. 21, 2020	Sep. 23, 2020	Sep. 25, 2019	Sep. 23, 2020	Sep. 25, 2019
Noncontrolling Interest [Line Items]
Non-controlling interest holders' weighted average ownership percentage		7.50%	14.40%	7.90%	17.90%
ATM Program | Class A Common Stock
Noncontrolling Interest [Line Items]
Sale of stock, maximum offering price	$ 75,000,000
Sale of stock, number of shares issued in transaction (in shares)	233,467
Proceeds from sale of stock	$ 9,794,000
Over-Allotment Option | Class A Common Stock
Noncontrolling Interest [Line Items]
Sale of stock, number of shares issued in transaction (in shares)	3,416,070
Proceeds from sale of stock	$ 135,857,000
Employee Stock Option
Noncontrolling Interest [Line Items]
Units acquired during the period (in shares)		38,564	172,403	180,068	383,117

X

- Definition

Consolidated Entity, Ownership By Parent, Number Of Units Acquired

+ References

No definition available.

+ Details

Name:	shak_ConsolidatedEntityOwnershipByParentNumberOfUnitsAcquired
Namespace Prefix:	shak_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Noncontrolling Interest, Weighted Average Ownership Percentage

+ References

No definition available.

+ Details

Name:	shak_NoncontrollingInterestWeightedAverageOwnershipPercentage
Namespace Prefix:	shak_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Sale of Stock, Maximum Offering Price

+ References

No definition available.

+ Details

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

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

No definition available.

+ Details

Name:	us-gaap_MinorityInterestLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Cash received on stock transaction after deduction of issuance costs.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockConsiderationReceivedOnTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

+ References

No definition available.

+ Details

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=shak_ATMProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_OverAllotmentOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_AwardTypeAxis=us-gaap_EmployeeStockOptionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: