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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 30, 2018
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Persol Holdings Investment |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Cost of equity securities | $ 19.2 | $ 18.8
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 without readily determinable fair value, with changes in fair value in net income | 1.3 |
Other Assets | Kenzie Academy Inc. |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Equity securities without readily determinable fair value, amount | $ 1.0 |

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