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Provision for Taxes (Effective income tax rate reconciliation) (Details)
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
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]      
NOL tax rate benefit 0.00% (38.62%) 0.00%
State taxes, net of federal benefit 2.53% 0.02% 2.41%
Foreign rate differential 0.00% 0.21% 0.15%
Federal tax credits 0.99% 0.53% 0.15%
Transition tax 0.00% 0.00% (0.20%)
Tax exempt income (0.08%) (0.17%) 0.00%
Dividends received deduction 0.01% 0.01% 0.01%
Other 0.87% 1.19% (0.86%)
Actual tax expense of operations 23.32% (16.91%) 22.34%