Annual report [Section 13 and 15(d), not S-K Item 405]

Commitments and Contingencies - Related Party Transactions (Details)

v3.26.1
Commitments and Contingencies - Related Party Transactions (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2026
Dec. 07, 2023
Mar. 31, 2026
Mar. 31, 2025
Selling, General and Administrative Expense        
Selling, general and administrative     $ 26,858 $ 26,205
Redeemable Preferred Units        
Selling, General and Administrative Expense        
Redemption of preferred units $ 83,500   83,465  
Capstone Distributor Support Services Corporation        
Asset Acquisition, Consideration Transferred        
Cash paid at close 1,000      
Affiliated Entity        
Selling, General and Administrative Expense        
Percentage of PrivateCo's income (as a percent)   90.00%    
Other income     $ 2,300 $ 2,500
Affiliated Entity | Redeemable Preferred Units        
Selling, General and Administrative Expense        
Redemption of preferred units 83,500      
Affiliated Entity | Capstone Distributor Support Services Corporation        
Asset Acquisition, Consideration Transferred        
Cash paid at close $ 1,000      
Affiliated Entity | Capstone Green Energy Corporation (Reorganized PrivateCo)        
Selling, General and Administrative Expense        
Related party transaction, annual royalty payment   $ 100    
Affiliated Entity | Capstone Green Energy LLC (Operating Subsidiary)        
Selling, General and Administrative Expense        
Services fee   $ 2,500    
Services fee cap threshold incremental percentage (as a percent)   3.50%    
Services fee cap incremental percentage (as a percent)   1.75%