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Revenue from Contract with Customers - Net Sales by Product (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Dec. 25, 2020
Dec. 27, 2019
Dec. 25, 2020
Dec. 27, 2019
Disaggregation of Revenue [Line Items]        
Total net sales $ 164,449 $ 159,802 $ 416,099 $ 475,485
Power integrated circuits (“PIC”)        
Disaggregation of Revenue [Line Items]        
Total net sales 54,406 43,665 146,276 123,900
Magnetic sensors (“MS”)        
Disaggregation of Revenue [Line Items]        
Total net sales 109,457 91,837 268,956 275,275
Photonics        
Disaggregation of Revenue [Line Items]        
Total net sales 586 0 867 0
Wafer foundry products        
Disaggregation of Revenue [Line Items]        
Total net sales 0 16,634 0 49,622
Distribution of Sanken products        
Disaggregation of Revenue [Line Items]        
Total net sales $ 0 $ 7,666 $ 0 $ 26,688