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Segment Information - Narrative (Details)
$ in Thousands
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jan. 28, 2021
USD ($)
Apr. 30, 2019
USD ($)
Jan. 01, 2022
USD ($)
Sep. 25, 2021
USD ($)
Jun. 26, 2021
USD ($)
Mar. 27, 2021
USD ($)
Dec. 26, 2020
USD ($)
Sep. 26, 2020
USD ($)
Jun. 27, 2020
USD ($)
Mar. 28, 2020
USD ($)
Jun. 26, 2021
USD ($)
Jan. 01, 2022
USD ($)
segment
Dec. 26, 2020
USD ($)
Dec. 28, 2019
USD ($)
Segment Reporting Information                            
Number of operating segments | segment                       3    
Integration cost     $ 3,600 $ 2,000 $ 500 $ 800 $ 700 $ 300 $ 100          
Restructuring, impairment and other costs       $ 800     $ 800 $ 1,300 1,800     $ 2,158 $ 41,716 $ 13,033
Restructuring charges                       $ 2,158 5,638 $ 12,711
Impairments                         $ 33,841  
Other asset impairment charges                 33,800          
Net sales | Geographic Concentration Risk | Outside the United States                            
Segment Reporting Information                            
Concentration risk (less than)                       69.00% 73.00% 71.00%
Net sales | Geographic Concentration Risk | China                            
Segment Reporting Information                            
Concentration risk (less than)                       30.00% 30.00% 28.00%
Net sales | Customer Concentration Risk | Arrow Electronics Inc.                            
Segment Reporting Information                            
Concentration risk (less than)                       10.70% 10.40% 10.70%
Electronics                            
Segment Reporting Information                            
Restructuring, impairment and other costs         800             $ 1,124 $ 2,540 $ 5,501
Restructuring charges                       1,124 2,540 5,501
Impairments                          
Transportation                            
Segment Reporting Information                            
Restructuring, impairment and other costs                       687 34,698 6,287
Restructuring charges                       687 857 5,965
Impairments                 33,800       33,841  
Transportation | Senor Reporting Unit                            
Segment Reporting Information                            
Impairments                 $ 33,800          
Other restructuring charges                            
Segment Reporting Information                            
Restructuring charges   $ 1,400                   283 185 2,352
Other restructuring charges | Electronics                            
Segment Reporting Information                            
Restructuring charges                       0 0 188
Other restructuring charges | Transportation                            
Segment Reporting Information                            
Restructuring charges                       283 175 1,714
Employee terminations                            
Segment Reporting Information                            
Restructuring charges   $ 1,700                   1,875 5,453 10,359
Employee terminations | Electronics                            
Segment Reporting Information                            
Restructuring charges                       1,124 2,540 5,313
Employee terminations | Transportation                            
Segment Reporting Information                            
Restructuring charges                       404 682 4,251
Hartland Controls                            
Segment Reporting Information                            
Inventory adjustment $ 6,800       3,300 $ 3,500                
Hartland Controls | Electronics                            
Segment Reporting Information                            
Gain (loss) on sale of properties         $ (1,000)           $ 900 5,000    
IXYS Corporation | Employee terminations                            
Segment Reporting Information                            
Restructuring charges                         41,700 $ 13,000
IXYS | Transportation                            
Segment Reporting Information                            
Other asset impairment charges                   $ 2,200        
Operating Income (Loss)                            
Segment Reporting Information                            
Restructuring charges                         5,500  
Operating Income (Loss) | Hartland Controls | Other                            
Segment Reporting Information                            
Integration cost                         7,000  
Restructuring, impairment and other costs                         2,200  
Operating Income (Loss) | IXYS Corporation                            
Segment Reporting Information                            
Legal, accounting and other expenses                         $ 2,300  
Other | Operating Income (Loss) | Hartland Controls                            
Segment Reporting Information                            
Inventory adjustment                       $ 8,400