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Accounting Pronouncements (Effects of Adoption of ASU 2018-12 Balance Sheet) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Jun. 30, 2024
--- | --- | --- | ---
Statements Adjusted [Abstract] |  |  |
Deferred policy acquisition costs, net | $ 121,621 | $ 121,729 |
Assets | 20,848,368 | 20,479,170 | $ 19,305,427
Policy benefits and losses, claims and loss expenses payable | 871,530 | 857,521 |
Deferred Income Tax Liabilities, Net | 1,504,547 | 1,489,920 |
Total liabilities | 13,187,600 | 12,981,027 |
Accumulated other comprehensive loss | 200,196 | 229,314 |
Retained earnings | 8,065,393 | 7,931,886 |
Stockholders' Equity Attributable to Parent | 7,660,768 | 7,498,143 |
Liabilities and Equity | 20,848,368 | 20,479,170 |
Operating Segments [Member] | Life Insurance [Member] |  |  |
Statements Adjusted [Abstract] |  |  |
Assets | $ 3,134,650 | $ 3,066,907 |

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