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Common And Preferred Stock (Narrative) (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017
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Class of Stock Disclosures [Abstract] |  |  |  |
Common stock, shares authorized | 100,000,000 |  |  |
Common Stock, Shares, Outstanding | 24,421,835 | 24,989,946 | 24,930,725 | 25,274,506
Preferred stock, shares authorized | 5,000,000 |  |  |
Stock Repurchase Program, Authorized Amount | $ 100 |  |  |
Preferred stock, shares outstanding | 0 |  |  |
Stock Repurchase Program, Remaining Authorized Repurchase Amount | $ 56 |  |  |

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