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Investment in PersolKelly Pte. Ltd. - Narrative (Details) $ in Millions |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Mar. 01, 2022 USD ($) | Apr. 01, 2020 USD ($) | Jul. 04, 2021 USD ($) | Jan. 03, 2021 USD ($) | Jan. 01, 2023 USD ($) | Jan. 02, 2022 USD ($) | Jan. 03, 2021 USD ($) | Feb. 14, 2022 country
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of equity method investment |  |  |  |  | $ 119.5 | $ 0.0 | $ 0.0 |
Equity in net earnings (loss) of affiliate |  |  |  |  | 0.8 | 5.4 | $ 0.8 |
Equity securities, FV-NI and without readily determinable fair value |  |  |  |  | 6.4 |  |  |
Investment in equity affiliate |  |  |  |  | $ 0.0 | $ 123.4 |  |
PersolKelly Pte. Ltd. |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  | 2.50% |  |  |
PersolKelly Pte. Ltd. |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  |  |  |  | 49.00% |  | 49.00%
Number of Geographies in Which Entity Operates | country |  |  |  |  |  |  |  | 10
Equity method investment, amount sold, percentage |  |  |  |  |  |  |  | 95.00%
Proceeds from sale of equity method investment | $ 119.5 |  |  |  |  |  |  |
Equity method investment, amount sold | 117.6 |  |  |  |  |  |  |
Amounts reclassified from accumulated other comprehensive income (loss) - liquidation of Japan subsidiary | (1.9) |  |  |  |  |  |  |
Gain on disposal | $ 1.9 |  |  |  |  |  |  |
Equity securities, FV-NI and without readily determinable fair value |  |  |  |  | $ 6.4 |  |  |
Repayment of loan |  |  |  | $ 5.6 |  |  |  |
Proceeds from collection of long-term loans to related parties |  |  | $ 5.8 |  |  |  |  |
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from Royalties Received |  | $ 0.7 |  |  |  |  |  |
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited | Joint Venture |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Proceeds from sale of equity method investment |  | $ 17.5 |  |  |  |  |  |
Equity Method Investment, Ownership Percentage Sold |  | 100.00% |  |  |  |  |  |

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