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Investment in PersolKelly Pte Ltd. (Details) - USD ($) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 01, 2020 | Jan. 03, 2021 | Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019 | Dec. 29, 2019 | Dec. 30, 2018
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity in net earnings (loss) of affiliate |  |  | $ 1,800,000 | $ (900,000) | $ (1,000,000.0) | $ (1,000,000.0) |  |
Investment in equity affiliate |  |  | $ 115,600,000 |  | $ 115,600,000 |  | $ 117,200,000 |
PersolKelly Pte. Ltd. |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Equity method investment, ownership percentage |  |  | 49.00% |  | 49.00% |  |  |
Due from PersolKelly Pte. Ltd. |  |  | $ 10,900,000 |  | $ 10,900,000 |  | $ 10,900,000 |
Advances to PersolKelly Pte. Ltd. |  |  |  | $ 4,400,000 |  | $ 4,400,000 |  | $ 7,000,000.0
PersolKelly Pte. Ltd. | Prepaid Expenses and Other Current Assets |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Advances to PersolKelly Pte. Ltd. |  |  | $ 5,600,000 |  | $ 5,600,000 |  |  |
PersolKelly Pte. Ltd. | Subsequent Event [Member] |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Repayment of Notes Receivable from Related Parties |  | $ 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 |  |  |  |  |  |  |
Joint Venture | Kelly Services Australia Pty Ltd and Kelly Services (New Zealand) Limited |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |
Ownership percentage sold | 100.00% |  |  |  |  |  |  |
Proceeds from sale of equity method investments | $ 17,500,000 |  |  |  |  |  |  |

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