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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Jan. 03, 2021 | Dec. 29, 2019 | Dec. 30, 2018
Accounting Policies [Abstract] |  |  |
Fiscal period duration | 371 days | 364 days | 364 days
Advertising expense | $ 8.1 | $ 9.4 | $ 8.7
Short-term Debt [Line Items] |  |  |
Accounts payable | 536.8 | 503.6 |
Accrued payroll and related taxes | 293.0 | 267.6 |
Liability for claims | 1.0 |  |
Book overdrafts |  |  |
Short-term Debt [Line Items] |  |  |
Accounts payable | 9.3 | 5.9 |
Accrued payroll and related taxes | $ 11.0 | $ 21.9 |
PersolKelly Pte. Ltd. |  |  |
Short-term Debt [Line Items] |  |  |
Equity method investment, ownership percentage | 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 -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 50 -Paragraph 3 -Subparagraph (cc) -URI http://asc.fasb.org/extlink&oid=116884095&loc=d3e14764-158437 + Details
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