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Fair Value Measurements - Fair Value Measurements on a Recurring Basis (Details) - USD ($) $ in Millions | Jan. 02, 2022 | Jan. 03, 2021
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Investment in Persol Holdings | $ 264.3 | $ 164.2
Measured on a recurring basis |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 96.3 | 120.3
Investment in Persol Holdings | 264.3 | 164.2
Total assets at fair value | 360.6 | 284.5
Brazil indemnification | (2.4) | (2.6)
Total liabilities at fair value | (7.0) | (6.4)
Measured on a recurring basis | Greenwood/Asher |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Earnout, fair value | (4.6) | (2.1)
Measured on a recurring basis | Insight |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Earnout, fair value | 0.0 | (1.7)
Measured on a recurring basis | Level 1 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 96.3 | 120.3
Investment in Persol Holdings | 264.3 | 164.2
Total assets at fair value | 360.6 | 284.5
Brazil indemnification | 0.0 | 0.0
Total liabilities at fair value | 0.0 | 0.0
Measured on a recurring basis | Level 1 | Greenwood/Asher |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Earnout, fair value | 0.0 | 0.0
Measured on a recurring basis | Level 1 | Insight |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Earnout, fair value | 0.0 | 0.0
Measured on a recurring basis | Level 2 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 0.0 | 0.0
Investment in Persol Holdings | 0.0 | 0.0
Total assets at fair value | 0.0 | 0.0
Brazil indemnification | 0.0 | 0.0
Total liabilities at fair value | 0.0 | 0.0
Measured on a recurring basis | Level 2 | Greenwood/Asher |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Earnout, fair value | 0.0 | 0.0
Measured on a recurring basis | Level 2 | Insight |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Earnout, fair value | 0.0 | 0.0
Measured on a recurring basis | Level 3 |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Money market funds | 0.0 | 0.0
Investment in Persol Holdings | 0.0 | 0.0
Total assets at fair value | 0.0 | 0.0
Brazil indemnification | (2.4) | (2.6)
Total liabilities at fair value | (7.0) | (6.4)
Measured on a recurring basis | Level 3 | Greenwood/Asher |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Earnout, fair value | (4.6) | (2.1)
Measured on a recurring basis | Level 3 | Insight |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Earnout, fair value | $ 0.0 | $ (1.7)

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