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Segment Information - Narrative (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 28, 2021
USD ($)
Jun. 26, 2021
USD ($)
Jun. 27, 2020
USD ($)
Mar. 28, 2020
USD ($)
Jun. 26, 2021
USD ($)
segment
Jun. 27, 2020
USD ($)
Segment Reporting Information            
Number of operating segments | segment         3  
Acquisition related costs   $ 100     $ 800  
Restructuring charges   789 $ 1,824   1,226 $ 3,549
Hartland Controls            
Segment Reporting Information            
Inventory adjustment $ 6,800 (500)        
IXYS            
Segment Reporting Information            
Restructuring charges           39,600
Operating Income (Loss) | IXYS            
Segment Reporting Information            
Acquisition related Costs and integration costs     100     1,300
Operating Income (Loss) | Corporate Non-Segment | Hartland Controls            
Segment Reporting Information            
Inventory adjustment   3,300     6,800  
Other | Operating Income (Loss) | Hartland Controls            
Segment Reporting Information            
Acquisition related costs   500     1,300  
Restructuring charges   800     1,300  
Industrial            
Segment Reporting Information            
Restructuring charges   6 772   169 1,096
Electronics            
Segment Reporting Information            
Restructuring charges   295 855   552 1,737
Electronics | Hartland Controls            
Segment Reporting Information            
Gain (loss) on sale of properties   1,000     900  
Automotive            
Segment Reporting Information            
Restructuring charges   488 197   505 716
Automotive | IXYS            
Segment Reporting Information            
Restructuring charges     1,800     3,500
Other asset impairment charges       $ 2,200    
Employee terminations            
Segment Reporting Information            
Restructuring charges   717 1,815   1,137 3,416
Employee terminations | IXYS            
Segment Reporting Information            
Restructuring charges     35,600      
Employee terminations | Industrial            
Segment Reporting Information            
Restructuring charges   6 750   169 1,071
Employee terminations | Electronics            
Segment Reporting Information            
Restructuring charges   295 856   552 1,737
Employee terminations | Automotive            
Segment Reporting Information            
Restructuring charges   $ 416 209   $ 416 $ 608
Facility Closing | Automotive | IXYS            
Segment Reporting Information            
Other asset impairment charges     $ 33,800