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Related Party Transactions (Details)
 1 Months Ended 6 Months Ended 12 Months Ended
Feb. 02, 2021
USD ($)
shares
Nov. 02, 2020
USD ($)
shares
Oct. 14, 2020
USD ($)
Mar. 28, 2020
USD ($)
Mar. 30, 2018
USD ($)
shares
Sep. 25, 2020
Mar. 26, 2021
USD ($)
Mar. 27, 2020
USD ($)
lineofcredit
note
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
May 31, 2018
USD ($)
Jul. 31, 2014
Related Party Transaction [Line Items]                        
Stock issuance costs             $ 1,790,000          
Total net sales             591,207,000 $ 650,089,000        
Trade accounts receivable from related party             23,634,000 30,293,000        
Amounts due to related party             2,353,000 4,494,000        
Related party notes payable, less current portion             0 17,700,000        
Current portion of related party debt             0 25,000,000        
Noncash or part noncash divestiture, amount of consideration received             0 0        
Cost of goods sold             312,305,000 388,813,000        
Trade accounts receivable, net             69,500,000 59,457,000        
Sublease payments             4,385,000 5,456,000        
IPO - Selling Shareholders                        
Related Party Transaction [Line Items]                        
Number of shares issued in transaction (in shares) | shares 19,332,852 3,750,000                    
IPO                        
Related Party Transaction [Line Items]                        
Number of shares issued in transaction (in shares) | shares 0 28,750,000                    
Net proceeds $ 0 $ 321,425,000                    
Stock issuance costs   $ 8,450,000                    
Transition Services Agreement                        
Related Party Transaction [Line Items]                        
Fees received       $ 25,000                
Services comparison period       12 months                
Term of agreement       12 months                
Annual fees payable       $ 50,000                
Basis spread on cost       10.00%                
Extension term       12 months                
Period for notice of termination (at least)       60 days                
Eliminations                        
Related Party Transaction [Line Items]                        
Cost of goods sold             1,198,000          
Trade accounts receivable, net       $ 3,368,000                
OEP | IPO - Selling Shareholders                        
Related Party Transaction [Line Items]                        
Number of shares issued in transaction (in shares) | shares 1,832,852                      
Disposal Group, Disposed of by Sale, Not Discontinued Operations | PSL                        
Related Party Transaction [Line Items]                        
Noncash or part noncash divestiture, amount of consideration received       42,700,000                
Noncash or part noncash divestiture, amount of consideration transferred       $ 15,000,000                
Disposal Group, Disposed of by Sale, Not Discontinued Operations | PSL | Sanken | PSL                        
Related Party Transaction [Line Items]                        
Ownership percentage by majority shareholder       70.00%                
Disposal Group, Disposed of by Sale, Not Discontinued Operations | PSL | PSL                        
Related Party Transaction [Line Items]                        
Stated interest rate       2.70%                
Interest paid     $ 762,000                  
Repayments of related party notes receivable     51,377,000                  
Related party debt       $ 66,377,000                
Note receivable from related party       51,377,000                
Interest payable     $ 762,000       762,000          
Related Party Revenue                        
Related Party Transaction [Line Items]                        
Total net sales             104,661,000 184,557,000        
Distribution of Sanken products                        
Related Party Transaction [Line Items]                        
Total net sales             0 35,421,000        
Sanken                        
Related Party Transaction [Line Items]                        
Trade accounts receivable from related party             21,595,000 30,293,000        
Other accounts receivable from related party             198,000 558,000        
Purchases from related party               31,917,000        
Amounts due to related party               4,494,000        
Reimbursement of development costs             $ 0 1,440,000        
Promissory notes outstanding                 $ 30,000,000      
Stated interest rate                 2.52%      
Interest income               $ 55,000        
Number of notes payable | note               3        
Related party notes payable, less current portion               $ 17,700,000        
Number of line-of-credit agreements | lineofcredit               2        
Current portion of related party debt               $ 25,000,000        
Basis spread on variable rate           1.00%            
Interest expense               1,444,000        
Interest paid               1,538,000        
Lessee, operating terminate, period of notice             6 months          
Sublease payments             $ 200,000 200,000        
Sanken | SG8 Collaboration Agreement                        
Related Party Transaction [Line Items]                        
Reimbursement of development costs             0 0        
Reimbursement of development costs, percentage of costs incurred                       50.00%
Sanken | Related Party Revenue                        
Related Party Transaction [Line Items]                        
Total net sales             104,661,000 184,557,000        
Sanken | Distribution of Sanken products                        
Related Party Transaction [Line Items]                        
Total net sales               35,421,000        
PSL                        
Related Party Transaction [Line Items]                        
Trade accounts receivable from related party       $ 3,368,000     767,000          
Purchases from related party             42,196,000          
Amounts due to related party             1,739,000          
PSL | Discrete Technology Development Agreement                        
Related Party Transaction [Line Items]                        
Amounts due to related party             614,000          
PSL | IC Technology Development Agreement                        
Related Party Transaction [Line Items]                        
Fees received             1,200,000 1,200,000        
Fees paid             1,200,000 1,200,000        
PSL | Price Support Payment                        
Related Party Transaction [Line Items]                        
Purchases from related party             5,930,000          
PSL | PSL                        
Related Party Transaction [Line Items]                        
Repayments of related party notes receivable             2,601,000          
SEEL                        
Related Party Transaction [Line Items]                        
Trade accounts receivable from related party             1,272,000          
Director                        
Related Party Transaction [Line Items]                        
Monthly fee payable                   $ 19,000 $ 30,000  
Signing fee         $ 54,000              
Severance payment if terminated         $ 180,000              
Accelerated vesting, acceleration period         6 months              
Related party transaction amounts             318,000 494,000        
Director | Common Stock,  Class L                        
Related Party Transaction [Line Items]                        
Shares granted (in shares) | shares         12,000,000              
Directors and executive officers                        
Related Party Transaction [Line Items]                        
Related party debt             $ 0 $ 506,000