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Acquisitions - Fair Value of Assets Assumed and Liabilities Acquired (Details) - USD ($) $ in Millions | Dec. 29, 2019 | Jan. 02, 2019 | Dec. 30, 2018 | Sep. 05, 2017
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill | $ 127.8 |  | $ 107.3 |
NextGen Global Resources LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash |  | $ 3.5 |  |
Trade accounts receivable |  | 19.7 |  |
Other current assets |  | 0.3 |  |
Goodwill |  | 13.7 |  |
Intangibles |  | 21.5 |  |
Other noncurrent assets |  | 0.5 |  |
Current liabilities |  | (4.9) |  |
Purchase price paid, including working capital adjustments |  | 54.3 |  |
Global Technology Associates, LLC |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash |  | 0.1 |  |
Trade accounts receivable |  | 13.9 |  |
Other current assets |  | 0.1 |  |
Goodwill |  | 6.8 |  |
Intangibles |  | 17.3 |  |
Other noncurrent assets |  | 0.4 |  |
Current liabilities |  | (2.9) |  |
Purchase price paid, including working capital adjustments |  | $ 35.7 |  |
Teachers On Call, Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash |  |  |  | $ 1.8
Other current assets |  |  |  | 3.6
Goodwill |  |  |  | 18.7
Intangibles |  |  |  | 18.3
Other noncurrent assets |  |  |  | 0.5
Current liabilities |  |  |  | (3.9)
Purchase price paid, including working capital adjustments |  |  |  | $ 39.0

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