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FAIR VALUE MEASUREMENTS - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 30, 2020	Dec. 25, 2019	Dec. 26, 2018
Fair Value, Option, Quantitative Disclosures [Line Items]
Net unrealized gains on equity securities	$ (59,000)		$ 0
Impairment charges	7,644,000	$ 0	$ 0
Operating Lease, Right-of-Use Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Impairment charges	5,698,000
Property, Plant and Equipment
Fair Value, Option, Quantitative Disclosures [Line Items]
Impairment charges	1,893,000
Finance Lease, Right-of-Use Assets
Fair Value, Option, Quantitative Disclosures [Line Items]
Impairment charges	$ 53,000

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
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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
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Amount of unrealized gain (loss) recognized in the income statement on unsold other securities.

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