XML 66 R52.htm IDEA: XBRL DOCUMENT v3.21.1

NON-CONTROLLING INTERESTS - Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2021	Mar. 25, 2020
Noncontrolling Interest [Line Items]
Non-controlling interest holders' weighted average ownership percentage	7.00%	8.40%
Employee Stock Option
Noncontrolling Interest [Line Items]
Units acquired during the period (in shares)	355,849	77,903

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

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

- Details

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