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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 29, 2020 | Jan. 03, 2021 | Dec. 29, 2019 | Dec. 30, 2018 | Nov. 18, 2020 | Aug. 18, 2020 | Jan. 14, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Goodwill impairment charge | $ 147.7 | $ 147.7 | $ 0.0 | $ 0.0 |  |  |
Brazil |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Indemnification liability |  |  |  |  |  | $ 2.5 |
Indemnification liabilities, expense |  | 2.6 |  |  |  |  |
Greenwood/Asher |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Contingent consideration, liability |  |  |  |  | $ 2.1 |  |
Insight |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Contingent consideration, liability |  |  |  |  |  |  | $ 1.6
Expense related to earnout liability |  | 0.1 |  |  |  |  |
Persol Holdings Investment |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Cost of equity securities |  | 20.1 | 18.9 |  |  |  |
Business Talent Group, LLC |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Equity securities without readily determinable fair value, amount |  | 5.0 | 5.0 |  |  |  |
Kenzie Academy Inc. |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Equity securities, FV-NI and without readily determinable fair value |  | 1.4 | 1.3 |  |  |  |
Other Assets |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Money market funds |  | 5.1 | $ 4.9 |  |  |  |
Level 3 | Brazil |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Indemnification liability |  | 2.6 |  |  |  |  |
Level 3 | Greenwood/Asher |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Contingent consideration, liability |  | 2.1 |  |  |  |  |
Level 3 | Insight |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |
Contingent consideration, liability |  | $ 1.7 |  |  |  |  |

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