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Provision for Taxes (Effective income tax rate reconciliation) (Details) | 12 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Statutory federal income tax rate | 21.00% | 31.55% | 35.00%
Increase (Reduction) in Rate Resulting from [Abstract] |  |  |
Deferred tax liability revaluation | 0.00% | (58.25%) | 0.00%
State taxes, net of federal benefit | 2.41% | 2.33% | 2.66%
Foreign rate differential | 0.15% | 0.00% | (0.31%)
Federal tax credits | (0.15%) | (0.32%) | (0.41%)
Transition tax | (0.20%) | 1.83% | 0.00%
Dividends received deduction | (0.01%) | (0.03%) | (0.03%)
Phase III Tax | 0.00% | 0.63% | 0.00%
Other | (0.86%) | (1.73%) | (0.32%)
Actual tax expense of operations | 22.34% | (23.99%) | 36.59%

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