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Basis of Presentation - Narrative (Details) $ in Millions |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 13, 2019 element | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Jul. 01, 2023 USD ($) | Jul. 02, 2022 USD ($) | Apr. 02, 2022 USD ($) | Jul. 01, 2023 USD ($) | Jul. 02, 2022 USD ($) | Dec. 31, 2022 USD ($) | Sep. 30, 2021 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Total write-offs charged against allowance |  |  |  | $ 0.7 | $ 0.0 |  | $ 0.8 | $ 0.0 |  |
Allowance for doubtful accounts |  |  |  | 1.7 |  |  | 1.7 |  | $ 2.6 |
Research and development expense |  |  |  | 12.7 | $ 12.6 |  | 25.4 | 24.8 |  |
USDOT | AMPJ Award |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
USDOT grant receivable amount (up to) |  |  |  |  |  |  |  |  |  | $ 14.7
Portion of grant received |  |  |  |  |  | $ 5.2 |  |  |  |
Revenue recognized included in contract liability balance |  |  |  |  |  |  |  | $ 6.0 |  |
Test Systems Segment |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Severance charges |  |  |  | 0.6 |  |  |  |  |  |
Restructuring |  |  |  | $ 0.3 |  |  | $ 0.3 |  |  |
Sold | Semiconductor Test Business | Test Systems Segment |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Number of elements for contingent earnouts | element | 2 |  |  |  |  |  |  |  |  |
Earnout proceeds received |  | $ 3.4 | $ 11.3 |  |  |  |  |  |  |

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