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Segment Information - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 29, 2018
USD ($)
Sep. 29, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 30, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jul. 01, 2017
USD ($)
Apr. 01, 2017
USD ($)
Dec. 29, 2018
USD ($)
segment
Dec. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]                      
Number of operating segments | segment                 3    
Acquisition related costs $ 3,200 $ 2,900 $ 2,400 $ 11,700 $ 1,400 $ 4,800 $ 300 $ 1,500      
Backlog amortization costs $ 3,700 $ 3,100 $ 3,100 2,500              
Change in control expense       $ 2,100              
Total restructuring charges                 $ 10,365 $ 2,227 $ 3,995
Allocated share based compensation                 28,200 17,300 12,800
Impairment charges                 $ 2,218 $ 0 $ 14,809
Net sales | Geographic Concentration Risk | Outside the United States                      
Segment Reporting Information [Line Items]                      
Concentration risk (less than)                 70.00% 69.00% 66.00%
Net sales | Geographic Concentration Risk | China                      
Segment Reporting Information [Line Items]                      
Concentration risk (less than)                 27.00% 26.00% 25.00%
Net sales | Customer Concentration Risk | Arrow Electronics Inc.                      
Segment Reporting Information [Line Items]                      
Concentration risk (less than)                 10.70% 10.60%  
Other | Operating Income (Loss)                      
Segment Reporting Information [Line Items]                      
Acquisition related costs                 $ 88,700    
Inventory adjustment                 36,900    
Legal, accounting and other expenses                 18,700    
Backlog amortization costs                 12,400    
Change in control expense                 2,100    
Total restructuring charges                 8,300    
Impairment charges                 5,800   $ 14,800
Other asset impairment charges                 1,100    
Other | Selling, General and Administrative Expenses                      
Segment Reporting Information [Line Items]                      
Acquisition related costs                   $ 8,000 29,200
Total restructuring charges                   $ 2,200 1,900
Other | Cost of Sales                      
Segment Reporting Information [Line Items]                      
Total restructuring charges                     1,600
Other | SG&A and Research and development expenses                      
Segment Reporting Information [Line Items]                      
Total restructuring charges                     $ 2,500
IXYS Corporation                      
Segment Reporting Information [Line Items]                      
Acquisition related costs                 $ 11,000