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v3.19.3

Segment Information - Narrative (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 USD ($) | Sep. 29, 2018 USD ($) | Jun. 30, 2018 USD ($) | Sep. 28, 2019 USD ($) segment | Sep. 29, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |  |
Number of operating segments | segment |  |  |  | 3 |
Restructuring charges | $ 2,215 | $ 4,982 |  | $ 10,633 | $ 8,895
Impairment charges |  |  |  | 322 | 1,125
Impairment charges | 322 | 0 |  | $ 322 | 1,125
Net sales | Geographic Concentration Risk | Other countries |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Concentration risk (less than) |  |  |  | 10.00% |
Other | Operating Income (Loss) |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Acquisition related costs |  | 10,100 |  |  | 75,600
Inventory adjustment |  |  |  |  | 36,900
Legal, accounting and other expenses | 3,200 | 2,400 |  | $ 6,900 | 16,100
Backlog amortization costs |  | 3,100 |  |  | 8,700
Change in control expense |  |  |  |  | 2,100
Restructuring charges | $ 2,500 |  |  | $ 11,000 |
Impairment charges |  | 400 |  |  | 1,600
Other restructuring |  |  | $ 1,100 |  |
Impairment charges |  | 700 |  |  | 1,100
IXYS Corporation |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Acquisition related costs |  |  |  |  | 11,000
Allocated share based compensation |  |  |  |  | 4,500
Restructuring charges |  | $ 4,600 |  |  | $ 7,300

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