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PROPERTY AND EQUIPMENT - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 27, 2022 USD ($) facility	Mar. 28, 2021 USD ($)	Dec. 26, 2021 facility
Property, Plant and Equipment [Abstract]
Depreciation expense | $	$ 8,800	$ 6,500
Loss on fixed asset disposal | $	$ 8	$ 51
Number of facilities under construction | facility	19		13
Number of facilities opened | facility	8

X

- Definition

Number Of Facilities Opened

+ References

No definition available.

+ Details

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Namespace Prefix:	sg_
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Balance Type:	na
Period Type:	duration

X

- Definition

Number Of Facilities Under Construction

+ References

No definition available.

+ Details

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Namespace Prefix:	sg_
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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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

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