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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 |  |  |

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