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Other Assets - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 30, 2018 | Dec. 31, 2017 | Jan. 01, 2017 | Sep. 30, 2018 | Sep. 05, 2017
Business Acquisition [Line Items] |  |  |  |  |
Intangible amortization expense | $ 1.8 | $ 0.9 | $ 0.6 |  |
Advances to PersolKelly Asia Pacific | 7.0 |  |  |  |
Deferred sales commission | 2.3 |  |  |  |
Teachers On Call, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangibles |  |  |  |  | $ 18.3
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract] |  |  |  |  |
Finite-lived intangible assets, amortization expense, next 12 months | 1.6 |  |  |  |
Finite-lived intangible assets, amortization expense, year 2 | 1.6 |  |  |  |
Finite-lived intangible assets, amortization expense, year 3 | 1.5 |  |  |  |
Finite-lived intangible assets, amortization expense, year 4 | 1.2 |  |  |  |
Finite-lived intangible assets, amortization expense, year 5 | $ 1.2 |  |  |  |
Customer Relationships |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life | 10 years |  |  |  |
Customer Relationships | Teachers On Call, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangibles |  |  |  |  | 12.0
Candidate Database |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Finite-lived intangible asset, useful life | 4 years |  |  |  |
Candidate Database | Teachers On Call, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangibles |  |  |  |  | 1.5
Trademarks | Teachers On Call, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangibles |  |  |  |  | $ 4.8
Business Talent Group, LLC |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Equity securities without readily determinable fair value, amount | $ 5.0 |  |  | $ 5.0 |

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