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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) - USD ($)	12 Months Ended
	Dec. 26, 2021	Dec. 27, 2020	Dec. 29, 2019
Summary Of Significant Accounting Policies [Line Items]
Fiscal period, length	364 days	364 days	371 days
CARES act receivable	$ 2,400,000
Deposits	3,900,000	$ 3,800,000
Goodwill, impairment loss	0	0	$ 0
Advertising expense	$ 1,300,000	1,600,000	$ 1,800,000
Trade names
Summary Of Significant Accounting Policies [Line Items]
Impairment of intangible assets, finite-lived		3,700,000
Client partner list
Summary Of Significant Accounting Policies [Line Items]
Impairment of intangible assets, finite-lived		$ 3,500,000
Minimum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	5 years
Lessee, operating lease, renewal term (in years)	3 years
Finite-lived intangible asset, useful life	3 years
Maximum
Summary Of Significant Accounting Policies [Line Items]
Property, plant and equipment, useful life	7 years
Lessee, operating lease, renewal term (in years)	10 years

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- Definition

CARES Act Receivable

+ References

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Fiscal Period, Length

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- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
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Carrying amount of assets as of the balance sheet date pertaining to amounts paid by the insured (including a ceding company) under insurance or reinsurance contracts for which insurance risk is not transferred.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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