SEGMENT INFORMATION (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2021	Dec. 27, 2020	Dec. 29, 2019
Segment Reporting Information [Line Items]
Revenue from services	$ 2,173,622	$ 1,846,360	$ 2,368,779
Segment profit	131,757	59,442	132,530
Third-party processing fees for hiring tax credits	(734)	(495)	(960)
Amortization of software as a service assets	(2,709)	(2,307)	(1,624)
Acquisition/integration costs	0	0	(1,562)
Goodwill and intangible asset impairment charge	0	(175,189)	0
Gain on deferred compensation assets	(2,897)	(1,725)	(495)
Workforce reduction costs	1,993	12,570	3,301
COVID-19 government subsidies, net	4,222	6,211	0
Other benefits (costs)	(3,711)	4,496	1,010
Depreciation and amortization	(27,556)	(32,031)	(37,549)
Income (loss) from operations	68,442	(174,882)	66,179
Interest expense and other income, net	5,408	1,620	3,865
Income (loss) before tax expense (benefit)	$ 73,850	$ (173,262)	$ 70,044
Revenue from sales, percent	100.00%	100.00%	100.00%
United States
Segment Reporting Information [Line Items]
Revenue from services	$ 2,017,529	$ 1,729,171	$ 2,222,543
Revenue from sales, percent	92.80%	93.70%	93.80%
International operations
Segment Reporting Information [Line Items]
Revenue from services	$ 156,093	$ 117,189	$ 146,236
Revenue from sales, percent	7.20%	6.30%	6.20%
Net property and equipment, percent	5.60%	6.50%
PeopleReady
Segment Reporting Information [Line Items]
Segment profit	$ 82,398	$ 43,200	$ 82,106
PeopleManagement
Segment Reporting Information [Line Items]
Segment profit	$ 13,196	$ 11,717	12,593
PeopleManagement | Customer A | Revenue Benchmark | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.00%	10.10%
PeopleScout
Segment Reporting Information [Line Items]
Segment profit	$ 36,163	$ 4,525	$ 37,831
PeopleScout | Customer B | Revenue Benchmark | Customer Concentration Risk
Segment Reporting Information [Line Items]
Concentration risk, percentage	10.90%	10.10%	12.50%
Corporate Segment
Segment Reporting Information [Line Items]
Corporate unallocated	$ (27,937)	$ (20,714)	$ (21,870)
Contingent staffing | PeopleReady
Segment Reporting Information [Line Items]
Revenue from services	1,270,928	1,099,462	1,474,062
Contingent staffing | PeopleManagement
Segment Reporting Information [Line Items]
Revenue from services	639,741	586,822	642,233
Human resource outsourcing | PeopleScout
Segment Reporting Information [Line Items]
Revenue from services	$ 262,953	$ 160,076	$ 252,484