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Stock-Based Compensation - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2023
Apr. 01, 2022
Mar. 31, 2022
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued under company plans (in shares) 2,909,204   2,879,008 2,543,125
Incremental compensation cost $ 0.3      
RSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards outstanding under The 2020 Plan (in shares) 816,022   954,775 935,397
The 2020 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares) 5,050,000      
Percentage of outstanding shares 5.00%      
Additional shares authorized (in shares)   2,668,965    
Shares issued under company plans (in shares) 2,909,204      
Number of shares available for grant (in shares) 5,080,099      
The 2020 Equity Incentive Plan | RSU        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equity awards outstanding under The 2020 Plan (in shares) 816,022      
The 2020 Equity Incentive Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Additional shares authorized (in shares) 2,461,923      
Annual increase in shares available for issue (in shares) 5,000,000      
Transphorm Technology 2007 Stock Plan and 2015 Equity Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized (in shares) 2,588,077