Acquisitions - Narrative (Details) - USD ($) $ in Millions				3 Months Ended		6 Months Ended
	Apr. 17, 2020	Feb. 24, 2020	Feb. 27, 2019	Jun. 28, 2020	Jun. 30, 2019	Jun. 28, 2020	Jun. 30, 2019
Business Acquisition [Line Items]
Shares issued			$ 27.0
Merger and acquisition expenses				$ 1.0	$ 0.6	$ 1.4	$ 1.8
FTT Inc
Business Acquisition [Line Items]
Percentage of voting interests acquired			80.10%
FTT Core
Business Acquisition [Line Items]
Percentage of voting interests acquired			80.10%
FTT
Business Acquisition [Line Items]
Percentage of voting interests acquired			80.10%
Aggregate purchase price			$ 60.0
Total cash paid			33.0
Cash paid			17.7
Amount to be paid			$ 15.3
Payment period			3 years
Payments for previous acquisition						$ 4.8
Current liabilities			$ 7.5
Deferred tax liabilities			$ 7.0
Revenue					17.2		21.4
Operating income					1.6		1.7
Merger and acquisition expenses					$ 0.1		$ 1.3
FTT | Common Stock
Business Acquisition [Line Items]
Number of shares issued (in shares)			1,825,406	1,825,406
FTT | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired			$ 19.7
Useful life			13 years
FTT | In-process research and development
Business Acquisition [Line Items]
Intangible assets acquired			$ 8.5
FTT | Contracts and backlog
Business Acquisition [Line Items]
Intangible assets acquired			$ 2.1
Useful life			2 years
FTT | Trade names
Business Acquisition [Line Items]
Intangible assets acquired			$ 0.5
Useful life			2 years
Technical Directions, Inc.
Business Acquisition [Line Items]
Cash paid		$ 10.5
Optimized Performance Machining, Inc. (OPM)
Business Acquisition [Line Items]
Cash paid	$ 1.8