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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