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Segment Information - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Jan. 28, 2021
USD ($)
Sep. 25, 2021
USD ($)
Sep. 26, 2020
USD ($)
Jun. 27, 2020
USD ($)
Mar. 28, 2020
USD ($)
Sep. 25, 2021
USD ($)
segment
Sep. 26, 2020
USD ($)
Segment Reporting Information              
Number of operating segments | segment           3  
Acquisition related costs           $ 800  
Restructuring charges   $ 772 $ 1,277     1,998 $ 4,826
Hartland Controls              
Segment Reporting Information              
Inventory adjustment $ 6,800            
IXYS              
Segment Reporting Information              
Restructuring charges     1,300       40,900
Operating Income (Loss) | IXYS              
Segment Reporting Information              
Acquisition related Costs and integration costs     300       1,600
Operating Income (Loss) | Corporate Non-Segment | Hartland Controls              
Segment Reporting Information              
Inventory adjustment           6,800  
Other | Operating Income (Loss) | Hartland Controls              
Segment Reporting Information              
Acquisition related costs   2,000       3,400  
Restructuring charges   800       2,000  
Industrial              
Segment Reporting Information              
Restructuring charges   133 727     302 1,823
Electronics              
Segment Reporting Information              
Restructuring charges   542 388     1,094 2,125
Electronics | Hartland Controls              
Segment Reporting Information              
Gain (loss) on sale of properties           900  
Automotive              
Segment Reporting Information              
Restructuring charges   97 162     602 878
Automotive | Senor Reporting Unit              
Segment Reporting Information              
Goodwill impairment charge     33,800        
Automotive | IXYS              
Segment Reporting Information              
Other asset impairment charges         $ 2,200    
Employee terminations              
Segment Reporting Information              
Restructuring charges   675 1,198     1,812 4,614
Employee terminations | IXYS              
Segment Reporting Information              
Restructuring charges     1,200       4,600
Employee terminations | Industrial              
Segment Reporting Information              
Restructuring charges   133 648     302 1,719
Employee terminations | Electronics              
Segment Reporting Information              
Restructuring charges   542 388     1,094 2,125
Employee terminations | Automotive              
Segment Reporting Information              
Restructuring charges   0 162     416 770
Facility Closing | Automotive              
Segment Reporting Information              
Goodwill impairment charge       $ 33,800      
Other restructuring charges              
Segment Reporting Information              
Restructuring charges   97 79     186 212
Other restructuring charges | IXYS              
Segment Reporting Information              
Restructuring charges     100       200
Other restructuring charges | Industrial              
Segment Reporting Information              
Restructuring charges   0 79     0 104
Other restructuring charges | Electronics              
Segment Reporting Information              
Restructuring charges   0 0     0 0
Other restructuring charges | Automotive              
Segment Reporting Information              
Restructuring charges   $ 97 $ 0     $ 186 $ 108