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PROPERTY AND EQUIPMENT - Narrative (Details) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 30, 2025 USD ($) facility	Mar. 31, 2024 USD ($)	Dec. 29, 2024 facility
Property, Plant and Equipment [Abstract]
Depreciation expense | $	$ 14.4	$ 13.7
Number of facilities under construction | facility	9		9

X

- Definition

Number Of Facilities Under Construction

+ References

No definition available.

+ Details

Name:	sg_NumberOfFacilitiesUnderConstruction
Namespace Prefix:	sg_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (b)
-SubTopic 10
-Topic 230
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482099/360-10-50-1

+ Details

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

X

- References

No definition available.

+ Details

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