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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Textual) - USD ($) | 12 Months Ended
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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 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 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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- Definition 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 -Topic 340 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99397363&loc=d3e9420-108338 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99383045&loc=d3e9351-108337 + Details
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