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Investment in PersolKelly Kelly Pte. Ltd. - Narrative (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Apr. 01, 2020 USD ($) | Jan. 03, 2021 USD ($) country | Jan. 03, 2021 USD ($) country | Dec. 29, 2019 USD ($) | Dec. 30, 2018 USD ($) | Sep. 29, 2019 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity in net earnings (loss) of affiliate |  |  | $ 800,000 | $ (3,600,000) | $ 5,200,000 |
Investment in equity affiliate |  | $ 118,500,000 | $ 118,500,000 | 117,200,000 |  |
PersolKelly Pte. Ltd. |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity method investment, ownership percentage |  | 49.00% | 49.00% |  |  |
Number of Countries in which Entity Operates | country |  | 8 | 8 |  |  |
Due from PersolKelly Asia Pacific |  | $ 5,600,000 | $ 5,600,000 | $ 10,900,000 |  |
Advances to PersolKelly Asia Pacific |  |  |  |  | $ 7,000,000.0 | $ 4,400,000
Repayment of loan |  | $ 5,600,000 |  |  |  |
Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Proceeds from Royalties Received | $ 700,000 |  |  |  |  |
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 | $ 17,500,000 |  |  |  |  |

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