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Income Taxes - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Mar. 31, 2022
Income Tax Contingency [Line Items]        
Provision for income taxes $ 3,149 $ 3,642 $ 2,807  
Undistributed earnings of foreign subsidiaries 1,300 2,600 2,700  
Deferred tax assets, valuation allowance 368,773 368,408    
Operating loss carryforwards 1,023,800      
Operating loss carryforwards, subject to expiration 321,500      
Operating loss carryforward, indefinitely 702,300      
Unrecognized tax benefits 10,074 10,811 $ 10,113 $ 9,850
Accrued penalties and interest 0 $ 200    
Domestic        
Income Tax Contingency [Line Items]        
Research tax credit carryforwards 15,500      
State and local        
Income Tax Contingency [Line Items]        
Operating loss carryforwards 869,400      
Research tax credit carryforwards $ 24,200