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Segment Information - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Apr. 30, 2019
USD ($)
Dec. 26, 2020
USD ($)
Sep. 26, 2020
USD ($)
Jun. 27, 2020
USD ($)
Mar. 28, 2020
USD ($)
Dec. 28, 2019
USD ($)
Sep. 28, 2019
USD ($)
Jun. 29, 2019
USD ($)
Mar. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 26, 2020
USD ($)
segment
Dec. 28, 2019
USD ($)
Dec. 29, 2018
USD ($)
Segment Reporting Information                          
Number of operating segments | segment                     3    
Acquisition related costs   $ 700 $ 300 $ 100 $ 1,200 $ 1,900 $ 3,200 $ 1,500 $ 2,400        
Restructuring, impairment and other costs   $ 800 1,300 1,800   2,100 $ 2,500 5,700     $ 41,716 $ 13,033 $ 12,583
Other asset impairment charges       $ 33,800 1,900                
Restructuring charges                     5,638 12,711 10,365
Stock compensation expense                     18,129 19,046 27,431
Impairment charges     $ 100     $ 4,200   $ 200 $ 2,800   36,078 322 2,218
Automotive                          
Segment Reporting Information                          
Restructuring, impairment and other costs                     34,698 6,287 914
Other asset impairment charges         $ 2,200                
Restructuring charges                     857 5,965 826
Impairment charges                     33,841 322 88
Other restructuring charges                          
Segment Reporting Information                          
Restructuring charges $ 1,400                   185 2,352 862
Other restructuring charges | Automotive                          
Segment Reporting Information                          
Restructuring charges                     175 1,714 192
Employee terminations                          
Segment Reporting Information                          
Restructuring charges $ 1,700                   5,453 10,359 9,503
Employee terminations | Automotive                          
Segment Reporting Information                          
Restructuring charges                     $ 682 $ 4,251 $ 634
Net sales | Geographic Concentration Risk | Outside the United States                          
Segment Reporting Information                          
Concentration risk (less than)                     73.00% 71.00% 70.00%
Net sales | Geographic Concentration Risk | China                          
Segment Reporting Information                          
Concentration risk (less than)                     30.00% 28.00% 27.00%
Net sales | Customer Concentration Risk | Arrow Electronics Inc.                          
Segment Reporting Information                          
Concentration risk (less than)                     10.40% 10.70% 10.70%
Operating Income (Loss)                          
Segment Reporting Information                          
Acquisition related costs                       $ 8,900  
Restructuring charges                     $ 5,500    
Other | Operating Income (Loss)                          
Segment Reporting Information                          
Acquisition related costs                     $ 2,300   $ 88,700
Restructuring, impairment and other costs                         5,800
Restructuring charges                         8,300
Inventory adjustment                         36,900
Legal, accounting and other expenses                         18,700
Backlog amortization costs                         12,400
Change in control expense                         2,100
Other | Operating Income (Loss) | Other restructuring charges                          
Segment Reporting Information                          
Impairment charges                         2,200
IXYS Corporation                          
Segment Reporting Information                          
Acquisition related costs                         11,000
Inventory adjustment                   $ 36,900      
Stock compensation expense                         $ 4,500
IXYS Corporation | Employee terminations                          
Segment Reporting Information                          
Restructuring charges                       $ 13,000