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Acquisitions and Disposition - Fair Value of Assets Assumed and Liabilities Acquired (Details) - USD ($) $ in Millions | Jan. 02, 2022 | Apr. 05, 2021 | Jan. 03, 2021 | Nov. 18, 2020 | Jan. 14, 2020 | Dec. 29, 2019
--- | --- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 114.8 |  | $ 3.5 |  |  | $ 127.8
Softworld, Inc. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  | $ 1.4 |  |  |  |
Trade accounts receivable |  | 21.6 |  |  |  |
Prepaid expenses and other current assets |  | 3.3 |  |  |  |
Property and equipment |  | 1.2 |  |  |  |
Operating lease right-of-use assets |  | 7.6 |  |  |  |
Deferred taxes |  | 5.9 |  |  |  |
Goodwill |  | 111.3 |  |  |  |
Intangibles |  | 79.4 |  |  |  |
Other noncurrent assets |  | 1.2 |  |  |  |
Accounts payable and accrued liabilities, current |  | (2.5) |  |  |  |
Operating lease liabilities, current |  | (1.3) |  |  |  |
Accrued payroll and related taxes, current |  | (4.6) |  |  |  |
Income and other taxes, current |  | (1.2) |  |  |  |
Operating lease liabilities, noncurrent |  | $ (6.3) |  |  |  |
Greenwood/Asher |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  | $ 2.4 |  |
Trade accounts receivable |  |  |  | 0.4 |  |
Property and equipment |  |  |  | 0.2 |  |
Deferred taxes |  |  |  | 0.2 |  |
Goodwill |  |  |  | 3.5 |  |
Intangibles |  |  |  | 1.9 |  |
Other noncurrent assets |  |  |  | 0.3 |  |
Current liabilities |  |  |  | (1.2) |  |
Noncurrent liabilities |  |  |  | (0.4) |  |
Assets acquired net of liabilities assumed |  |  |  | $ 7.3 |  |
Insight |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Cash |  |  |  |  | $ 1.8 |
Trade accounts receivable |  |  |  |  | 9.6 |
Other current assets |  |  |  |  | 0.2 |
Property and equipment |  |  |  |  | 0.2 |
Goodwill |  |  |  |  | 19.9 |
Intangibles |  |  |  |  | 10.6 |
Other noncurrent assets |  |  |  |  | 0.2 |
Current liabilities |  |  |  |  | (2.6) |
Noncurrent liabilities |  |  |  |  | (0.1) |
Assets acquired net of liabilities assumed |  |  |  |  | $ 39.8 |

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