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Other Income (Expense), Net - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Apr. 03, 2022 | Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022
Other Income and Expense [Line Items] |  |  |  |
Interest Income, Money Market Deposits |  | $ 3.0 |  |
Gain on foreign currency remeasurement |  | 0.0 | $ 5.5 | $ 0.0
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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