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Provision for Taxes (Effective income tax rate reconciliation) (Details)
12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Effective Income Tax Rate Reconciliation, Percent [Abstract]      
Statutory federal income tax rate 21.00% 21.00% 21.00%
Increase (Reduction) in Rate Resulting from [Abstract]      
State taxes, net of federal benefit 3.56% 3.24% 2.53%
Foreign rate differential 0.08% 0.05% 0.00%
Federal tax credits 0.48% 0.19% 0.99%
Tax-exempt income 0.08% 0.03% 0.08%
Dividend received deduction 0.01% 0.00% 0.01%
Other 0.15% (0.20%) 0.87%
Actual tax expense of operations 24.22% 23.87% 23.32%