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Acquisitions and Disposition - Narrative (Details) - USD ($) $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 18, 2020 | Jan. 14, 2020 | Jan. 02, 2019 | Sep. 27, 2020 | Jan. 03, 2021 | Dec. 29, 2019 | Dec. 30, 2018
Greenwood/Asher |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired (percent) | 100.00% |  |  |  |  |  |
Purchase price of acquisition | $ 3.5 |  |  |  |  |  |
Purchase price paid at closing | 5.2 |  |  |  |  |  |
Contingent consideration, liability | 2.1 |  |  |  |  |  |
Intangible assets acquired | 1.9 |  |  |  |  |  |
Goodwill expected to be deductible |  |  |  |  | $ 0.9 |  |
Insight |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired (percent) |  | 100.00% |  |  |  |  |
Purchase price of acquisition |  | $ 34.5 |  |  |  |  |
Purchase price paid at closing |  | 38.1 |  |  |  |  |
Contingent consideration, liability |  | 1.6 |  |  |  |  |
Payments for previous acquisition |  |  |  | $ 0.1 |  |  |
Intangible assets acquired |  | $ 10.6 |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  | 10 years |  |  |  |  |
Expense related to earnout liability |  |  |  |  | 0.1 |  |
Goodwill expected to be deductible |  |  |  |  | $ 18.6 |  |
NextGen Global Resources LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired (percent) |  |  | 100.00% |  |  |  |
Purchase price of acquisition |  |  | $ 51.0 |  |  |  |
Purchase price paid at closing |  |  | 54.3 |  |  |  |
Intangible assets acquired |  |  | $ 21.5 |  |  |  |
Pro forma information, revenue of acquiree since acquisition date, actual |  |  |  |  |  | $ 78.3 |
Pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  |  |  |  | 4.5 |
Business combination, revenue reported by acquired entity for prior period |  |  |  |  |  |  | $ 67.8
Business combination, net earnings reported by acquired entity for prior period |  |  |  |  |  |  | 3.0
Global Technology Associates, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Ownership percentage acquired (percent) |  |  | 100.00% |  |  |  |
Purchase price of acquisition |  |  | $ 34.0 |  |  |  |
Purchase price paid at closing |  |  | 35.7 |  |  |  |
Intangible assets acquired |  |  | 17.3 |  |  |  |
Pro forma information, revenue of acquiree since acquisition date, actual |  |  |  |  |  | 62.8 |
Pro forma information, earnings or loss of acquiree since acquisition date, actual |  |  |  |  |  | $ 4.5 |
Business combination, revenue reported by acquired entity for prior period |  |  |  |  |  |  | 42.5
Business combination, net earnings reported by acquired entity for prior period |  |  |  |  |  |  | $ 3.3
Customer Relationships | Greenwood/Asher |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired | $ 1.3 |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) | 10 years |  |  |  |  |  |
Customer Relationships | NextGen Global Resources LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 12.9 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  |  | 10 years |  |  |  |
Customer Relationships | Global Technology Associates, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 12.1 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  |  | 10 years |  |  |  |
Trade Names | Greenwood/Asher |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired | $ 0.6 |  |  |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) | 10 years |  |  |  |  |  |
Trade Names | NextGen Global Resources LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 8.1 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  |  | 15 years |  |  |  |
Trade Names | Global Technology Associates, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 4.0 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  |  | 15 years |  |  |  |
Noncompete Agreements | NextGen Global Resources LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 0.5 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  |  | 5 years |  |  |  |
Noncompete Agreements | Global Technology Associates, LLC |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Intangible assets acquired |  |  | $ 1.2 |  |  |  |
Acquired finite-lived intangible assets, weighted average useful life (years) |  |  | 5 years |  |  |  |

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