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Acquisitions and Disposition - Acquisitions Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Apr. 05, 2021 | Nov. 18, 2020 | Jan. 14, 2020 | Jul. 04, 2021 | Apr. 04, 2021 | Jun. 28, 2020 | Mar. 29, 2020 | Jul. 04, 2021 | Jun. 28, 2020 | Jan. 03, 2021
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Pro forma revenues |  |  |  | $ 1,258.1 |  | $ 1,001.3 |  | $ 2,495.2 | $ 2,290.6 |
Pro forma net earnings (loss) |  |  |  | 24.0 |  | 42.0 |  | 51.2 | (112.8) |
Softworld, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired | 100.00% |  |  |  |  |  |  |  |  |
Purchase price of acquisition | $ 215.0 |  |  |  |  |  |  |  |  |
Purchase price paid at closing | 220.4 |  |  |  |  |  |  |  |  |
Net working capital adjustment | (6.0) |  |  |  |  |  |  |  |  |
Intangibles | 79.4 |  |  |  |  |  |  |  |  |
Amortization of intangible assets |  |  |  |  | $ 2.0 | 2.0 | $ 2.0 |  |  |
Additional consideration payable | 2.6 |  |  |  |  |  |  |  |  |
Pro forma information, revenue of acquiree since acquisition date, actual |  |  |  | 30.4 |  |  |  | 30.4 |  |
Pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  |  | 1.7 |  |  |  | 1.7 |  |
Softworld, Inc. | Customer Relationships |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangibles | $ 54.9 |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 10 years |  |  |  |  |  |  |  |  |
Softworld, Inc. | Noncompete Agreements |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangibles | $ 1.4 |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 5 years |  |  |  |  |  |  |  |  |
Softworld, Inc. | Trademarks and Trade Names |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Intangibles | $ 23.1 |  |  |  |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life | 10 years |  |  |  |  |  |  |  |  |
Greenwood/Asher |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  | 100.00% |  |  |  |  |  |  |  |
Purchase price of acquisition |  | $ 3.5 |  |  |  |  |  |  |  |
Purchase price paid at closing |  | 5.2 |  |  |  |  |  |  |  |
Additional consideration payable |  | $ 2.1 |  |  |  |  |  |  |  |
Adjustment to earnout liability |  |  |  |  | $ (0.4) |  |  | (0.4) |  |
Business acquisition, goodwill, expected tax deductible amount |  |  |  | 0.9 |  |  |  | 0.9 |  |
Insight |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired |  |  | 100.00% |  |  |  |  |  |  |
Purchase price of acquisition |  |  | $ 34.5 |  |  |  |  |  |  |
Purchase price paid at closing |  |  | 38.1 |  |  |  |  |  |  |
Additional consideration payable |  |  | $ 1.6 |  |  |  |  |  |  |
Adjustment to earnout liability |  |  |  | 0.1 |  |  |  |  |  | $ 0.1
Business acquisition, goodwill, expected tax deductible amount |  |  |  | $ 18.6 |  |  |  | 18.6 |  |
Payments for previous acquisition |  |  |  |  |  | $ 0.1 |  |  |  |
Acquisition-related Costs | Softworld, Inc. |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  | $ 1.3 | $ (1.3) |

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