SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 26, 2022	Jun. 27, 2021	Jun. 26, 2022	Jun. 27, 2021
Segment Reporting Information [Line Items]
Revenue	$ 569,253	$ 515,955	$ 1,120,768	$ 974,661
Segment profit	45,146	32,515	75,316	51,528
Third-party processing fees for hiring tax credits	(162)	(30)	(324)	(165)
Amortization of software as a service assets	(699)	(646)	(1,446)	(1,319)
PeopleReady technology implementation costs	(1,748)	0	(4,298)	0
COVID-19 government subsidies, net	0	2,296	0	4,039
Other benefits (costs)	491	(868)	355	(2,024)
Depreciation and amortization	(7,245)	(7,017)	(14,532)	(13,979)
Income (loss) from operations	29,252	18,943	41,242	25,154
Interest expense and other income, net	(110)	724	395	1,299
Income before tax expense	29,142	19,667	41,637	26,453
PeopleReady
Segment Reporting Information [Line Items]
Segment profit	20,325	18,437	36,544	30,297
PeopleManagement
Segment Reporting Information [Line Items]
Segment profit	4,228	3,221	7,207	6,337
PeopleScout
Segment Reporting Information [Line Items]
Segment profit	20,593	10,857	31,565	14,894
Corporate unallocated
Segment Reporting Information [Line Items]
Corporate unallocated expense	(6,531)	(7,307)	(13,829)	(12,926)
Contingent staffing \| PeopleReady
Segment Reporting Information [Line Items]
Revenue	317,943	299,316	623,633	559,708
Contingent staffing \| PeopleManagement
Segment Reporting Information [Line Items]
Revenue	161,938	152,356	325,757	304,110
Human resource outsourcing \| PeopleScout
Segment Reporting Information [Line Items]
Revenue	$ 89,372	$ 64,283	$ 171,378	$ 110,843

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