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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 24, 2023	Mar. 27, 2023	Dec. 25, 2022
Indefinite-lived Intangible Assets [Line Items]
Goodwill impairment loss	$ (8,885)
Goodwill	84,753		$ 93,784
PeopleManagement
Indefinite-lived Intangible Assets [Line Items]
Goodwill impairment loss	0
Goodwill	1,491		1,491
Indefinite-lived trade names/trademarks	3,300	$ 3,900
Non-cash impairment charge	600
PeopleScout
Indefinite-lived Intangible Assets [Line Items]
Goodwill	23,168		32,199
Trade names/trademarks
Indefinite-lived Intangible Assets [Line Items]
Indefinite-lived trade names/trademarks	5,400		$ 6,000
MSP [Member] | PeopleScout
Indefinite-lived Intangible Assets [Line Items]
Goodwill impairment loss	(8,885)
Goodwill	$ 800	$ 9,700
Minimum
Indefinite-lived Intangible Assets [Line Items]
Weighted average cost of capital		13.00%
Maximum
Indefinite-lived Intangible Assets [Line Items]
Weighted average cost of capital		13.50%

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