GOODWILL AND INTANGIBLE ASSETS - Changes in Carrying Amount of Goodwill (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 29, 2024	May 26, 2024	Mar. 31, 2024	Dec. 31, 2023
Goodwill [Line Items]
Goodwill impairment loss	$ (59,074)
Foreign currency translation	245
Goodwill before impairment	328,812			$ 328,567
Accumulated impairment loss	(303,527)			(244,453)
Goodwill, net	25,285			84,114
Minimum
Goodwill [Line Items]
Weighted average cost of capital		13.50%
Maximum
Goodwill [Line Items]
Weighted average cost of capital		14.50%
PeopleReady
Goodwill [Line Items]
Goodwill impairment loss	(59,074)
Foreign currency translation	0
Goodwill before impairment	105,284			105,284
Accumulated impairment loss	(105,284)			(46,210)
Goodwill, net	0		$ 59,100	59,074
PeopleScout
Goodwill [Line Items]
Goodwill impairment loss	0
Foreign currency translation	245
Goodwill before impairment	142,436			142,191
Accumulated impairment loss	(118,642)			(118,642)
Goodwill, net	23,794			23,549
PeopleManagement
Goodwill [Line Items]
Goodwill impairment loss	0
Foreign currency translation	0
Goodwill before impairment	81,092			81,092
Accumulated impairment loss	(79,601)			(79,601)
Goodwill, net	$ 1,491			$ 1,491