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Provision for Taxes (Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
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 | 4.78% | 3.56% | 3.24%
Foreign rate differential | 0.03% | 0.08% | 0.05%
Federal tax credits | 0.58% | 0.48% | 0.19%
Effective Income Tax Rate Reconciliation, Tax Exempt Income, Percent | 0.04% | 0.08% | 0.03%
Effective Income Tax Rate Reconciliation, Deduction, Dividend, Percent | 0.01% | 0.01% | 0.00%
Other | 0.01% | 0.15% | 0.22%
Actual tax expense of operations | 25.17% | 24.22% | 23.85%

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