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Segment Information - Narrative (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 28, 2019
USD ($)
Sep. 28, 2019
USD ($)
Jun. 29, 2019
USD ($)
Mar. 30, 2019
USD ($)
Dec. 29, 2018
USD ($)
Sep. 29, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 28, 2019
USD ($)
segment
Dec. 29, 2018
USD ($)
Dec. 30, 2017
USD ($)
Segment Reporting Information [Line Items]                      
Number of operating segments | segment                 3    
Acquisition related costs $ 1,900 $ 3,200 $ 1,500 $ 2,400 $ 3,200 $ 2,900 $ 2,400 $ 11,700      
Restructuring charges primarily related to employee termination costs 2,100 $ 2,500 5,700           $ 13,033 $ 12,583  
Backlog amortization costs               2,500      
Total restructuring charges                 12,711 10,365 $ 2,227
Stock compensation expense                 19,046 27,431 16,315
Allocated share based compensation                 19,900 28,200 17,300
Impairment charges $ 4,200   $ 200 $ 2,800         $ 322 $ 2,218 $ 0
Net sales | Geographic Concentration Risk | Outside the United States                      
Segment Reporting Information [Line Items]                      
Concentration risk (less than)                 71.00% 70.00% 69.00%
Net sales | Geographic Concentration Risk | China                      
Segment Reporting Information [Line Items]                      
Concentration risk (less than)                 28.00% 27.00% 26.00%
Net sales | Customer Concentration Risk | Arrow Electronics Inc.                      
Segment Reporting Information [Line Items]                      
Concentration risk (less than)                 10.70% 10.70% 10.60%
Selling, General and Administrative Expenses                      
Segment Reporting Information [Line Items]                      
Acquisition related costs                 $ 2,700    
Other | Operating Income (Loss)                      
Segment Reporting Information [Line Items]                      
Acquisition related costs                 8,900 $ 88,700  
Inventory adjustment                   36,900  
Legal, accounting and other expenses                   18,700  
Backlog amortization costs                   12,400  
Total restructuring charges                   8,300  
Change in control expense                   2,100  
Impairment charges                   5,800  
Other | Selling, General and Administrative Expenses                      
Segment Reporting Information [Line Items]                      
Acquisition related costs                     $ 8,000
Total restructuring charges                     $ 2,200
IXYS Corporation                      
Segment Reporting Information [Line Items]                      
Acquisition related costs                 $ 2,200 $ 11,000  
Backlog amortization costs         $ 3,700 $ 3,100 $ 3,100        
IXYS Corporation | Selling, General and Administrative Expenses                      
Segment Reporting Information [Line Items]                      
Stock compensation expense               $ 4,500