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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