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Segment Disclosures - Schedule of Segments (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue from services | $ 4,331.8 | $ 4,835.7 | $ 4,965.4
Cost of services | 3,449.2 | 3,874.3 | 3,953.6
SG&A expenses | 708.5 | 831.4 | 874.1
SG&A expenses | 818.4 | 934.7 | 943.5
Goodwill impairment charge | 72.8 | 0.0 | 41.0
Asset impairment charge | (13.5) | (2.4) |
Business unit profit (loss) | 101.3 | 127.6 | 96.7
Earnings (loss) from operations | (15.1) | 24.3 | 14.8
Loss on disposal | 0.0 | 0.0 | (18.7)
Gain on sale of assets | 5.4 | 0.0 | 6.2
Gain on sale of EMEA staffing operations | 1.6 | 0.0 | 0.0
Amortization of intangible assets | (51.5) | (40.1) | (37.1)
Loss on investment in Persol Holdings | 0.0 | 0.0 | (67.2)
Loss on currency translation from liquidation of subsidiary |  |  | (20.4)
Other income (expense), net | (6.8) | 0.6 | 1.6
Earnings (loss) before taxes and equity in net earnings of affiliate | (21.9) | 24.9 | (71.2)
Science, Engineering & Technology |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue from services | 1,422.8 | 1,190.8 | 1,265.4
Goodwill impairment charge | 72.8 | 0.0 |
Education |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Goodwill impairment charge | 0.0 | 0.0 |
Outsourcing & Consulting |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue from services | 468.3 | 454.7 | 468.0
International |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue from services | 0.0 | 812.1 | 887.0
Reporting Segments | Professional & Industrial |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue from services | 1,470.7 | 1,539.5 | 1,709.9
Cost of services | 1,209.4 | 1,262.4 | 1,396.8
Direct salaries | 141.2 | 163.5 | 185.1
Other segment expenses | 85.4 | 97.3 | 108.4
SG&A expenses | 226.6 | 260.8 | 293.5
Goodwill impairment charge | 0.0 |  | 0.0
Asset impairment charge |  | (0.3) |
Business unit profit (loss) | 34.7 | 16.0 | 19.6
Reporting Segments | Science, Engineering & Technology |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue from services | 1,422.8 | 1,190.8 | 1,265.4
Cost of services | 1,087.2 | 918.8 | 968.4
Direct salaries | 170.5 | 127.1 | 141.7
Other segment expenses | 75.3 | 69.8 | 76.3
SG&A expenses | 245.8 | 196.9 | 218.0
Goodwill impairment charge | 72.8 |  | 0.0
Asset impairment charge |  | (0.1) |
Business unit profit (loss) | 17.0 | 75.0 | 79.0
Reporting Segments | Education |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue from services | 972.3 | 841.9 | 636.2
Cost of services | 832.5 | 713.2 | 535.9
Direct salaries | 60.5 | 59.6 | 50.8
Other segment expenses | 35.4 | 32.8 | 30.7
SG&A expenses | 95.9 | 92.4 | 81.5
Goodwill impairment charge | 0.0 |  | 0.0
Asset impairment charge |  | 0.0 |
Business unit profit (loss) | 43.9 | 36.3 | 18.8
Reporting Segments | Outsourcing & Consulting |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue from services | 468.3 | 454.7 | 468.0
Cost of services | 322.4 | 291.2 | 298.4
Direct salaries | 104.3 | 116.6 | 114.8
Other segment expenses | 35.9 | 42.7 | 39.8
SG&A expenses | 140.2 | 159.3 | 154.6
Goodwill impairment charge | 0.0 |  | 41.0
Asset impairment charge |  | (2.0) |
Business unit profit (loss) | 5.7 | 2.2 | (26.0)
Reporting Segments | International |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue from services | 0.0 | 812.1 | 887.0
Cost of services |  | 692.0 | 755.2
Direct salaries |  | 83.6 | 85.1
Other segment expenses |  | 38.4 | 41.4
SG&A expenses |  | 122.0 | 126.5
Goodwill impairment charge |  |  | 0.0
Asset impairment charge |  | 0.0 |
Business unit profit (loss) |  | (1.9) | 5.3
Less: Intersegment revenue |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
Revenue from services | (2.3) | (3.3) | (1.1)
Cost of services | (2.3) | (3.3) | (1.1)
SG&A expenses | 0.0 | 0.0 | 0.0
Goodwill impairment charge | 0.0 |  | 0.0
Asset impairment charge |  | 0.0 |
Business unit profit (loss) | 0.0 | 0.0 | 0.0
Corporate |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |
SG&A expenses | $ (58.4) | $ (63.2) | $ (32.3)

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