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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 04, 2021 | Apr. 04, 2021 | Jun. 28, 2020 | Mar. 29, 2020 | Jul. 04, 2021 | Jun. 28, 2020 | Jan. 03, 2021 | Mar. 08, 2021 | Nov. 18, 2020 | Jan. 14, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Indemnification liabilities, expense (income) |  |  |  |  | $ (0.1) |  |  |  |  |
Goodwill impairment charge | $ 0.0 |  | $ 0.0 | $ 147.7 | 0.0 | $ 147.7 |  |  |  |
Proceeds from Sale of Equity Securities, FV-NI |  |  |  |  | 5.0 | $ 0.0 |  |  |  |
Insight |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Additional consideration payable |  |  |  |  |  |  |  |  |  | $ 1.6
Adjustment to earnout liability | 0.1 |  |  |  |  |  | $ 0.1 |  |  |
Greenwood/Asher |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Additional consideration payable |  |  |  |  |  |  |  |  | $ 2.1 |
Adjustment to earnout liability |  | $ (0.4) |  |  | (0.4) |  |  |  |  |
Persol Holdings Investment |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Cost of equity securities | 18.7 |  |  |  | 18.7 |  | 20.1 |  |  |
Business Talent Group, LLC |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Proceeds from Sale of Equity Securities, FV-NI | 5.0 |  |  |  |  |  |  |  |  |
Kenzie Academy Inc. |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Equity securities without readily determinable fair value, with changes in fair value in net income |  |  |  |  |  |  | 1.4 | $ 1.4 |  |
Debt and equity securities, realized gain (loss) |  | $ (1.4) |  |  |  |  |  |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Money market funds | 6.1 |  |  |  | 6.1 |  | 5.1 |  |  |
Level 3 |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Indemnification liability | 2.7 |  |  |  | 2.7 |  | 2.6 |  |  |
Level 3 | Insight |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Additional consideration payable | 1.8 |  |  |  | 1.8 |  | 1.7 |  |  |
Level 3 | Greenwood/Asher |  |  |  |  |  |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |  |  |  |  |  |
Additional consideration payable | $ 1.7 |  |  |  | $ 1.7 |  | $ 2.1 |  |  |

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