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v3.19.2

Segment Information - Narrative (Details) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 29, 2019 USD ($) | Jun. 30, 2018 USD ($) | Jun. 29, 2019 USD ($) segment | Jun. 30, 2018 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Number of operating segments | segment |  |  | 3 |
Restructuring charges | $ 5,683 | $ 3,134 | $ 8,418 | $ 3,913
Impairment charges |  |  | $ 0 | 1,125
Impairment charges |  | 1,125 |  | 1,125
Net sales | Geographic Concentration Risk | Other countries(a) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Concentration risk (less than) |  |  | 10.00% |
Other | Operating Income (Loss) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acquisition related costs |  | 26,800 |  | 65,400
Inventory adjustment |  | 19,000 |  | 36,900
Legal, accounting and other expenses | 1,500 | 2,000 | $ 3,800 | 13,600
Backlog amortization costs |  | 3,100 |  | 5,600
Change in control expense |  | 2,100 |  |
Restructuring charges | $ 5,700 |  | $ 8,400 |
Impairment charges |  | 500 |  | 1,200
Other restructuring |  | 1,100 |  |
Impairment charges |  | 300 |  | 500
IXYS Corporation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Acquisition related costs |  | 800 |  | 11,000
Allocated share based compensation |  |  |  | 4,500
Employee Stock Option | IXYS Corporation |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Allocated share based compensation |  | $ 1,600 |  | 7,500
Restructuring charges |  |  |  | $ 2,700

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