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Acquisitions and Dispositions - Acquisitions Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 13, 2024 | May 31, 2024 | Mar. 07, 2022 | Dec. 29, 2024 | Jul. 03, 2022 | Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill, net |  |  |  | $ 304.2 |  | $ 304.2 | $ 151.1 | $ 151.1
Goodwill impairment charge |  |  |  |  |  | 72.8 | $ 0.0 | 41.0
Children's Therapy Center (CTC) | Kelly Services USA, LLC (KSU) |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership percentage acquired (percent) | 100.00% |  |  |  |  |  |  |
Purchase price of acquisition | $ 3.3 |  |  |  |  |  |  |
Purchase price paid at closing | 3.1 |  |  |  |  |  |  |
Goodwill, net | $ 3.0 |  |  |  |  |  |  |
Motion Recruitment Partners, LLC (MRP) |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership percentage acquired (percent) |  | 100.00% |  |  |  |  |  |
Purchase price of acquisition |  | $ 425.0 |  |  |  |  |  |
Purchase price paid at closing |  | 440.0 |  |  |  |  |  |
Goodwill, net |  | 222.9 |  |  |  |  |  |
Business combination, consideration transferred, other |  | 3.4 |  |  |  |  |  |
Possible future contingent consideration |  | 60.0 |  |  |  |  |  |
Contingent consideration, liability |  |  |  | 0.0 |  | 0.0 |  |
Payments to acquire businesses, working capital adjustment |  |  |  | $ 1.4 |  |  |  |
Intangible assets acquired |  | 145.9 |  |  |  |  |  |
Pro forma information, revenue of acquiree since acquisition date, actual |  |  |  |  |  | 285.8 |  |
Pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  |  |  |  | $ 4.2 |  |
Motion Recruitment Partners, LLC (MRP) | Customer relationships |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets acquired |  | $ 88.1 |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  | 15 years |  |  |  |  |  |
Motion Recruitment Partners, LLC (MRP) | Trade names |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets acquired |  | $ 56.5 |  |  |  |  |  |
Motion Recruitment Partners, LLC (MRP) | Trade names | Minimum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  | 10 years |  |  |  |  |  |
Motion Recruitment Partners, LLC (MRP) | Trade names | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  | 15 years |  |  |  |  |  |
Motion Recruitment Partners, LLC (MRP) | Non-compete agreements |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Intangible assets acquired |  | $ 1.3 |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  | 4 years |  |  |  |  |  |
Pediatric Therapeutic Services |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership percentage acquired (percent) |  |  |  |  | 100.00% |  |  |
Purchase price of acquisition |  |  |  |  | $ 82.1 |  |  |
Purchase price paid at closing |  |  |  |  | $ 85.7 |  |  |
RocketPower |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership percentage acquired (percent) |  |  | 100.00% |  |  |  |  |
Purchase price of acquisition |  |  | $ 59.3 |  |  |  |  |
Purchase price paid at closing |  |  | $ 61.8 |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  | $ 41.0

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