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ASU 2018 - 12 Transition (Adoption Of New Accounting Pronouncement Adjustments To Select Tables) (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2024 | Mar. 31, 2021 | Mar. 31, 2020
Statements Adjusted [Abstract] |  |  |  |  |
Assets | $ 18,100,734 | $ 17,327,183 | $ 19,058,758 | $ 14,651,606 | $ 14,693,044
Liabilities | 11,596,543 |  | 11,886,313 | 9,732,515 | $ 9,846,608
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 6,504,191 | 5,897,161 | $ 7,172,445 | 4,919,091 |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Statements Adjusted [Abstract] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | $ 72,655 |
Derecognition of shadow reserves | 25,141 | 26,131 |  |  |
Other adjustments | 1,227 | 1,471 |  |  |
Subtotal | 23,914 | 27,602 |  |  |
After adoption | 18,100,734 | 17,327,183 |  |  |
Cumulative Effect Of Adoption Liabilities [Member] |  |  |  |  |
Statements Adjusted [Abstract] |  |  |  |  |
Derecognition of FIT on shadow reserves | 5,280 | 5,488 |  |  |
Re-measurement due to discount rate | 1,626 | 87,258 |  |  |
Re-measurement due to discount rate FIT | 342 | 18,324 |  |  |
Other adjustments | 6,794 | 8,511 |  |  |
Subtotal | 230 | 82,933 |  |  |
After adoption | 11,596,543 | 11,430,022 |  |  |
Cumulative Effect Of Adoption Comprehensive Income [Member] |  |  |  |  |
Statements Adjusted [Abstract] |  |  |  |  |
Derecognition of shadow reserves | 19,861 | 20,644 |  |  |
Re-measurement due to discount rate | 1,626 | 87,258 |  |  |
Re-measurement due to discount rate FIT | 342 | 18,324 |  |  |
Subtotal | 18,577 | 48,290 |  |  |
After adoption | 285,623 | 1,906 |  |  |
Cumulative Effect Of Adoption Stockholders Equity [Member] |  |  |  |  |
Statements Adjusted [Abstract] |  |  |  |  |
Derecognition of shadow reserves | 19,861 | 20,644 |  |  |
Re-measurement due to discount rate | 1,284 | 68,934 |  |  |
Other adjustments | 5,567 | 7,041 |  |  |
Subtotal | 24,144 | 55,331 |  |  |
After adoption | 6,504,191 | 5,897,161 |  |  |
Scenario Previously Reported [Member] |  |  |  |  |
Statements Adjusted [Abstract] |  |  |  |  |
Assets | 18,124,648 | 17,299,581 |  |  |
Liabilities | 11,596,313 |  |  |  |
Scenario Previously Reported [Member] | Cumulative Effect Of Adoption Liabilities [Member] |  |  |  |  |
Statements Adjusted [Abstract] |  |  |  |  |
Liabilities | 11,596,313 | 11,347,089 |  |  |
Scenario Previously Reported [Member] | Cumulative Effect Of Adoption Comprehensive Income [Member] |  |  |  |  |
Statements Adjusted [Abstract] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | 267,046 | 46,384 |  |  |
Scenario Previously Reported [Member] | Cumulative Effect Of Adoption Stockholders Equity [Member] |  |  |  |  |
Statements Adjusted [Abstract] |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | $ 6,528,335 | $ 5,952,492 |  |  |

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