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Acquisition of Nora - Narrative (Details) $ in Thousands, € in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 07, 2018 USD ($) | Aug. 07, 2018 EUR (€) | Jun. 30, 2019 USD ($) | Sep. 29, 2019 USD ($) | Sep. 30, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Payments to acquire businesses, net of cash acquired |  |  |  | $ 0 | $ 400,697
Nora |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Purchase price | $ 447,200 | € 385.1 |  |  |
Cash acquired from acquisition | 46,500 | 40.0 |  |  |
Payments to acquire businesses, net of cash acquired | 400,700 | € 345.1 |  |  |
Adjustment, deferred tax liabilities |  |  | $ 17,200 |  |
Goodwill, purchase accounting adjustments |  |  | $ 17,200 |  |
Intangible assets acquired | 103,300 |  |  |  |
Step-up of inventory | 26,600 |  |  |  |
Nora | Developed Technology Rights |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 39,100 |  |  |  |
Weighted average useful life | 7 years | 7 years |  |  |
Nora | Order or Production Backlog |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 3,400 |  |  |  |
Weighted average useful life | 6 months | 6 months |  |  |
Nora | Trademarks and Trade Names |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Intangible assets acquired | $ 60,800 |  |  |  |

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