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Acquisitions - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Jan. 02, 2019	Sep. 29, 2019	Sep. 30, 2018	Sep. 29, 2019	Sep. 30, 2018
NextGen Global Resources LLC
Business Acquisition [Line Items]
Ownership percentage acquired	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		$ 20.0		$ 62.9
Pro forma information, earnings or loss of acquiree since acquisition date, actual		1.3		3.7
Business combination, revenue reported by acquired entity for prior period			$ 19.3		$ 47.5
Business combination, net earnings reported by acquired entity for prior period			1.4		2.0
Global Technology Associates, LLC
Business Acquisition [Line Items]
Ownership percentage acquired	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		15.8		48.2
Pro forma information, earnings or loss of acquiree since acquisition date, actual		$ 0.9		$ 3.4
Business combination, revenue reported by acquired entity for prior period			11.9		28.2
Business combination, net earnings reported by acquired entity for prior period			$ 1.1		$ 1.8
Customer Relationships | NextGen Global Resources LLC
Business Acquisition [Line Items]
Intangible assets acquired	$ 12.9
Acquired finite-lived intangible assets, weighted average useful life	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	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	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	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	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	5 years

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