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Investment in PersolKelly Pte. Ltd. - Narrative (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Apr. 01, 2020 USD ($) | Jul. 04, 2021 USD ($) | Jan. 03, 2021 USD ($) | Jan. 02, 2022 USD ($) country | Jan. 03, 2021 USD ($) | Dec. 29, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity in net earnings (loss) of affiliate |  |  |  | $ 5.4 | $ 0.8 | $ (3.6)
Investment in equity affiliate |  |  | $ 118.5 | $ 123.4 | $ 118.5 |
PersolKelly Pte. Ltd. |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 49.00% | 49.00% | 49.00% |
Number of Geographies in Which Entity Operates | country |  |  |  | 10 |  |
Investment in equity affiliate |  |  |  | $ 123.4 |  |
Due from PersolKelly Asia Pacific |  |  | $ 5.6 |  | $ 5.6 |
Proceeds from collection of long-term loans to related parties |  | $ 5.8 |  |  |  |
Repayment of loan |  |  | $ 5.6 |  |  |
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] |  |  |  |  |  |
Equity Method Investment, Ownership Percentage Sold | 100.00% |  |  |  |  |
Proceeds from sale of equity method investments | $ 17.5 |  |  |  |  |

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