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Revenue from Contract with Customers - Net Sales by Core End Market and Application (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 26, 2021
Mar. 27, 2020
Disaggregation of Revenue [Line Items]    
Total net sales $ 591,207 $ 650,089
Automotive    
Disaggregation of Revenue [Line Items]    
Total net sales 398,298 395,277
Industrial    
Disaggregation of Revenue [Line Items]    
Total net sales 94,872 78,399
Other    
Disaggregation of Revenue [Line Items]    
Total net sales 98,037 68,622
Wafer foundry products    
Disaggregation of Revenue [Line Items]    
Total net sales 0 72,370
Distribution of Sanken products    
Disaggregation of Revenue [Line Items]    
Total net sales $ 0 $ 35,421