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Other Income (Expense), Net - Narrative (Details) - USD ($) $ in Millions | 2 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 15, 2022 | Apr. 03, 2022 | Dec. 29, 2024 | Dec. 31, 2023 | Jan. 01, 2023
Other Income and Expense [Line Items] |  |  |  |  |
Interest income, money market deposits |  |  | $ 3.0 | $ 3.0 |
Gain on foreign currency remeasurement |  |  | 0.0 | 0.0 | $ 5.5
Equity securities gain (loss) | $ (52.4) |  | 3.8 |  |
Disposition, increase (decrease) in indemnification liabilities |  |  | (0.7) |  |
Motion Recruitment Partners, LLC (MRP) |  |  |  |  |
Other Income and Expense [Line Items] |  |  |  |  |
Business combination, acquisition related costs |  |  | 8.6 |  |
Write-off of earnout liability |  |  | $ 3.4 |  |
Kelly Services Japan, Inc. |  |  |  |  |
Other Income and Expense [Line Items] |  |  |  |  |
Gain on foreign currency remeasurement |  | $ 5.5 |  |  | $ 5.5
Business Talent Group, LLC |  |  |  |  |
Other Income and Expense [Line Items] |  |  |  |  |
Proceeds from (investment in) equity securities, investing activities |  |  |  | $ 2.0 |

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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
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