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Policy Benefits And Losses Claims And Loss Expenses Payable (Present Value Expected Future Policy Benefits) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Payout annuities and market risk benefits | $ 2,393,590 |  | $ 2,398,884 |  |
Life and annuity ICOS and IBNR / Reinsurance losses payable |  |  |  |  | $ 41,438
Policy benefit and losses, claims and loss expense balance, end of period | 865,397 |  | 880,202 |  |
Oxford |  |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Balance, beginning of year | 720,581 | $ 830,363 | 740,992 | $ 971,882 |
Beginning balance at original discount rate | 734,392 | 812,235 | 760,198 | 821,286 |
Effect of changes in cash flow assumptions |  |  | 0 | 0 |
Effect of actual variances from expected experience |  |  | (4,780) | 2,744 |
Adjusted beginning of year balance |  |  | 755,418 | 824,030 |
Issuances | 5,288 | 16,536 |  |  |
Interest accrual | 17,568 | 19,105 |  |  |
Net premium collected | (43,882) | (47,436) |  |  |
Other | 0 | 0 |  |  |
Ending balance at original discount rate | 734,392 | 812,235 |  |  |
Effect of changes in discount rate assumptions (AOCI) | (13,811) | 18,128 |  |  |
Balance, end of the year | 720,581 | 830,363 |  |  |
End of period, LFPB, net | 323,265 | 342,038 |  |  |
Payout annuities and market risk benefits | 30,685 | 33,157 |  |  |
Life and annuity ICOS and IBNR / Reinsurance losses payable | 10,101 | 11,226 |  |  |
Life DPL/Other life and health | 26,556 | 37,130 |  |  |
End of period balance, Oxford | 390,607 | 423,551 |  |  |
Balance, Moving and Storage | 324,642 | 348,854 |  |  |
Balance, Property and Casualty | 150,148 | 156,998 |  |  |
Policy benefit and losses, claims and loss expense balance, end of period | 865,397 | 929,403 |  |  |
Life Insurance Segment [Member] | Oxford |  |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Balance, beginning of year | 524,729 | 577,061 | 530,938 | 672,254 |
Beginning balance at original discount rate | 523,780 | 551,154 | 533,688 | 552,109 |
Effect of changes in cash flow assumptions |  |  | 0 | 0 |
Effect of actual variances from expected experience |  |  | (565) | 1,031 |
Adjusted beginning of year balance |  |  | 533,123 | 553,140 |
Issuances | 5,211 | 14,083 |  |  |
Interest accrual | 13,166 | 13,714 |  |  |
Net premium collected | (27,720) | (29,783) |  |  |
Other | 0 | 0 |  |  |
Ending balance at original discount rate | 523,780 | 551,154 |  |  |
Effect of changes in discount rate assumptions (AOCI) | 949 | 25,907 |  |  |
Balance, end of the year | 524,729 | 577,061 |  |  |
Health Insurance Product Line [Member] |  |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Life and annuity ICOS and IBNR / Reinsurance losses payable |  |  |  |  | $ 0
Health Insurance Product Line [Member] | Oxford |  |  |  |  |
Liability For Future Policy Benefit Expected Future Policy Benefit [Roll Forward] |  |  |  |  |
Balance, beginning of year | 195,852 | 253,302 | 210,054 | 299,628 |
Beginning balance at original discount rate | 210,612 | 261,081 | 226,510 | 269,177 |
Effect of changes in cash flow assumptions |  |  | 0 | 0 |
Effect of actual variances from expected experience |  |  | (4,215) | 1,713 |
Adjusted beginning of year balance |  |  | $ 222,295 | $ 270,890 |
Issuances | 77 | 2,453 |  |  |
Interest accrual | 4,402 | 5,391 |  |  |
Net premium collected | (16,162) | (17,653) |  |  |
Other | 0 | 0 |  |  |
Ending balance at original discount rate | 210,612 | 261,081 |  |  |
Effect of changes in discount rate assumptions (AOCI) | (14,760) | (7,779) |  |  |
Balance, end of the year | $ 195,852 | $ 253,302 |  |  |

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