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REVENUE RECOGNITION - Narrative (Details)	12 Months Ended
	Dec. 28, 2025 revenue_stream
Revenue from Contract with Customer [Abstract]
Number of revenue streams	1

X

- Definition

Number Of Revenue Stream

+ References

No definition available.

+ Details

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

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- References

No definition available.

+ Details

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