Acquisitions - Narrative (Details) - USD ($) $ in Millions			3 Months Ended
	Feb. 24, 2020	Feb. 27, 2019	Mar. 29, 2020	Mar. 31, 2019
Business Acquisition [Line Items]
Shares issued		$ 27.0
Merger and acquisition expenses			$ 0.4	$ 1.2
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			$ 4.7
Current liabilities		$ 7.5
Deferred tax liabilities		$ 7.0
Revenue				4.2
Operating income				0.1
Merger and acquisition expenses				$ 1.2
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