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ASU 2018 - 12 Transition (Transition Adjustment Stockholders' Equity) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2020
--- | --- | --- | --- | --- | ---
Liability for Future Policy Benefit, before Reinsurance [Abstract] |  |  |  |  |
Deferred acquisition costs and related asset balances | $ 121,224 | $ 128,463 | $ 131,430 |  |
Tax effect | 223,216 | 285,623 |  | $ 106,857 | $ 42,319
Stockholders' Equity Attributable to Parent | 7,172,445 | 6,504,191 |  | 4,919,091 | $ 4,846,436
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance [Abstract] |  |  |  |  |
Tax effect | $ 223,216 | $ 285,623 | $ 1,906 | 106,857 |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance [Abstract] |  |  |  |  |
Tax effect |  |  |  | 64,538 |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained Earnings [Member] |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance [Abstract] |  |  |  |  |
Liability For Future Policy Benefits |  |  |  | (4,326) |
Market risk benefits |  |  |  | (3,791) |
Stockholders' Equity Attributable to Parent |  |  |  | (8,117) |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |  |
Liability for Future Policy Benefit, before Reinsurance [Abstract] |  |  |  |  |
Liability For Future Policy Benefits |  |  |  | (123,132) |
Deferred acquisition costs and related asset balances |  |  |  | 41,438 |
Tax effect |  |  |  | 17,156 |
Stockholders' Equity Attributable to Parent |  |  |  | $ (64,538) |

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