v3.26.1
Equity - Beneficiaries Customer ExAlt Trusts (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Class of Stock [Line Items]    
Noncontrolling interest, increase from subsidiary equity issuance   $ 2.2
Charitable Beneficiaries    
Class of Stock [Line Items]    
Percentage of distributions entitled to residual beneficiary, distributions received 2.50%  
Percent of distributions entitled to residual beneficiary, payments on amounts due 5.00%  
Percent of distributions entitled to residual beneficiary, amount of excess cash collateral 10.00%  
Noncontrolling interest, increase from subsidiary equity issuance $ 0.4 $ 0.0