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Revenue from Contract with Customers - Net Sales by Product (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
Power integrated circuits (“PIC”)    
Disaggregation of Revenue [Line Items]    
Total net sales 203,600 165,911
Magnetic sensors (“MS”)    
Disaggregation of Revenue [Line Items]    
Total net sales 386,372 376,387
Photonics    
Disaggregation of Revenue [Line Items]    
Total net sales 1,235 0
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