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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Jan. 01, 2023 | Jan. 02, 2022 | Feb. 14, 2022
Accounting Policies [Line Items] |  |  |  |
Advertising expense | $ 7.8 | $ 6.4 | $ 7.5 |
Property and equipment, net, held for sale | 27.8 |  |  |
Depreciation expense | 12.4 | 13.6 | 16.4 |
Intangible assets, accumulated amortization | 64.1 | 44.9 |  |
Intangible assets, accumulated amortization, held for sale | 2.3 |  |  |
Accounts payable | 646.1 | 723.3 |  |
Accrued payroll and related taxes | 156.2 | 315.8 |  |
Disposal Group, Held-for-Sale, Not Discontinued Operations |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Short-term hosted software | 0.1 |  |  |
Long-term hosted software | 3.4 |  |  |
Workers Compensation |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Liability for claims | 1.0 |  |  |
Cloud Computing Arrangements |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Amortization of intangible assets | 6.9 | 4.2 | $ 2.2 |
Intangible assets, accumulated amortization | 14.2 | 7.3 |  |
Prepaid Expenses and Other Current Assets | Cloud Computing Arrangements |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Short-term hosted software | 4.9 | 2.7 |  |
Other Noncurrent Assets | Cloud Computing Arrangements |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Long-term hosted software | 27.3 | 21.0 |  |
Book overdrafts |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Accounts payable | 1.2 | 0.4 |  |
Accrued payroll and related taxes | $ 9.6 | $ 67.6 |  |
PersolKelly Pte. Ltd. |  |  |  |
Accounting Policies [Line Items] |  |  |  |
Equity method investment, ownership percentage |  |  | 49.00% | 49.00%

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- Definition Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 720 -SubTopic 35 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483406/720-35-50-1 + Details
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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (b) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482686/350-30-45-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482665/350-30-50-2 + Details
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