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Revenue - Disaggregation of Revenues by Service Type (Details) - USD ($) $ in Millions	12 Months Ended
	Jan. 01, 2023	Jan. 02, 2022	Jan. 03, 2021
Disaggregation of Revenue [Line Items]
Revenue from services	$ 4,965.4	$ 4,909.7	$ 4,516.0
Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	1,666.2	1,837.4	1,858.4
Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	1,265.4	1,156.8	1,019.1
Education
Disaggregation of Revenue [Line Items]
Revenue from services	636.2	416.5	286.9
Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue from services	468.0	432.1	363.5
International
Disaggregation of Revenue [Line Items]
Revenue from services	932.2	1,067.8	988.6
Staffing services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	1,228.2	1,402.4	1,423.3
Staffing services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	869.0	813.2	751.8
Staffing services | Education
Disaggregation of Revenue [Line Items]
Revenue from services	627.8	411.5	286.4
Staffing services | International
Disaggregation of Revenue [Line Items]
Revenue from services	892.3	1,032.9	971.8
Permanent Placement | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	28.9	24.7	9.9
Permanent Placement | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	29.7	24.4	12.5
Permanent Placement | Education
Disaggregation of Revenue [Line Items]
Revenue from services	8.4	5.0	0.5
Permanent Placement | International
Disaggregation of Revenue [Line Items]
Revenue from services	22.6	21.3	16.8
Outcome-Based Services | Professional & Industrial
Disaggregation of Revenue [Line Items]
Revenue from services	409.1	410.3	425.2
Outcome-Based Services | Science, Engineering & Technology
Disaggregation of Revenue [Line Items]
Revenue from services	366.7	319.2	254.8
Talent Solutions | Outsourcing & Consulting
Disaggregation of Revenue [Line Items]
Revenue from services	468.0	432.1	363.5
Talent Solutions | International
Disaggregation of Revenue [Line Items]
Revenue from services	17.3	13.6	0.0
Intersegment Eliminations
Disaggregation of Revenue [Line Items]
Revenue from services	$ (2.6)	$ (0.9)	$ (0.5)

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+ References

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