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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details) - USD ($)	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Property, Plant and Equipment [Line Items]
Impairment charges	$ 7,644,000	$ 0	$ 0
Equipment | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	7 years
Equipment | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	2 years
Furniture and Fixtures | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	7 years
Furniture and Fixtures | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	2 years
Computer Equipment and Software | Maximum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	7 years
Computer Equipment and Software | Minimum
Property, Plant and Equipment [Line Items]
Useful life of property and equipment	2 years

X

- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ 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=121586364&loc=d3e3602-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228

+ Details

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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

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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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- Details

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