Acquisition - Narrative (Details) $ in Millions			3 Months Ended		9 Months Ended
	Feb. 28, 2019 USD ($)	Feb. 27, 2019 USD ($) shares	Sep. 29, 2019 USD ($) shares	Sep. 30, 2018 USD ($)	Sep. 29, 2019 USD ($)	Sep. 30, 2018 USD ($)
Business Acquisition [Line Items]
Aggregate purchase price		$ 60.0
Shares issued		$ 27.0
Merger and acquisition expenses			$ 0.1	$ 0.0	$ 1.9	$ 0.0
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	20.7
Amount to be paid		$ 15.3
Payment period		3 years
Increase in minority interest purchase price over next 12 months		14
Current liabilities		$ 7.5
Deferred tax liabilities		$ 6.3
Revenue			16.3		37.7
Operating income			0.7		1.0
Merger and acquisition expenses			$ 0.0		$ 1.3
FTT | Common Stock
Business Acquisition [Line Items]
Number of shares issued (in shares) | shares		1,825,406	1,825,406
FTT | Customer relationships
Business Acquisition [Line Items]
Intangible assets acquired		$ 16.3
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		$ 1.6
Useful life		2 years
FTT | Trade names
Business Acquisition [Line Items]
Intangible assets acquired		$ 0.5
Useful life		2 years