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Investments - Summary of Amortized Cost and Estimated Fair Value of Available-for-Sale Investments, Excluding VIE Investments (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024
--- | --- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | $ 0 | $ 0 | $ 0 | $ 0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 260 | 881 |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  |  | 792 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 60,829 | 68,012 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 3,735 | 4,559 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 5,351 | 3,994 | 5,351 |
Fixed maturity securities, at fair value |  | 263,179 |  |
Debt Securities, Available-for-sale, Amortized Cost | 289,712 | 266,292 |  |
Debt Securities, Available-for-Sale, Current | 284,621 | 263,179 |  |
Short-term Investments [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 13 | 6 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 | 0 |  |
Fixed maturity securities, at fair value | 127,601 | 101,610 |  |
Debt Securities, Available-for-sale, Amortized Cost | 127,588 | 101,604 | 127,588 |
Fixed Income Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 247 | 875 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 5,351 | 3,994 |  |
Fixed maturity securities, at fair value | 157,020 | 161,569 |  |
Debt Securities, Available-for-sale, Amortized Cost | 162,124 | 164,688 |  |
Fixed Income Securities [Member] | Municipal Bonds [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 8,730 | 12,624 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 7 | 53 |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 2,070 | 6,042 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 35 | 112 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 6,660 | 6,582 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 373 | 458 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 570 | 408 | 570 |
Fixed maturity securities, at fair value | 14,083 | 14,305 |  |
Debt Securities, Available-for-sale, Amortized Cost | 14,646 | 14,660 |  |
Fixed Income Securities [Member] | Corporate Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 51,803 | 70,396 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 107 | 343 |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 9,782 | 23,784 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 135 | 269 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 42,021 | 46,612 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 3,018 | 3,636 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 3,905 | 3,153 | 3,905 |
Fixed maturity securities, at fair value | 89,192 | 89,169 |  |
Debt Securities, Available-for-sale, Amortized Cost | 92,990 | 91,979 |  |
Fixed Income Securities [Member] | Foreign Obligations [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 0 | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 0 | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 0 | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 0 | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 0 | 0 |
Fixed Income Securities [Member] | US Government Debt Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 18,852 | 30,737 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 98 | 429 |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 6,704 | 15,919 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 46 | 344 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 12,148 | 14,818 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 344 | 465 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 809 | 390 | 809 |
Fixed maturity securities, at fair value | 40,995 | 44,860 |  |
Debt Securities, Available-for-sale, Amortized Cost | 41,706 | 44,821 |  |
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 1,899 | 2,446 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 0 | 16 |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 1,899 | 2,446 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 18 | 29 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 0 | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 29 | 18 | 29 |
Fixed maturity securities, at fair value | 2,446 | 3,445 |  |
Debt Securities, Available-for-sale, Amortized Cost | 2,475 | 3,447 |  |
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 654 | 655 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 13 | 14 |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 654 | 655 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 1 | 2 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 0 | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2 | 1 | 2 |
Fixed maturity securities, at fair value | 3,142 | 2,954 |  |
Debt Securities, Available-for-sale, Amortized Cost | 3,131 | 2,941 |  |
Fixed Income Securities [Member] | Asset-backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 848 | 1,428 |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 14 | 16 |  |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 848 | 1,428 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 2 | 2 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 0 | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2 | 2 | 2 |
Fixed maturity securities, at fair value | 5,061 | 4,787 |  |
Debt Securities, Available-for-sale, Amortized Cost | 5,049 | 4,773 |  |
Fixed Income Securities [Member] | Commercial Mortgage Backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position |  | 750 | 738 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months |  | 750 | 738 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss |  | 22 | 34 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer |  | 0 | 0 |
Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss |  | 0 | 0 |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax |  | 22 | $ 34 |
Fixed maturity securities, at fair value |  | 2,049 |  |
Debt Securities, Available-for-sale, Amortized Cost |  | 2,067 |  |
Fixed Income Securities [Member] | Collateralized Mortgage Backed Securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | 0 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 8 | 4 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 34 | 22 |  |
Fixed maturity securities, at fair value | 2,101 | 2,049 |  |
Debt Securities, Available-for-sale, Amortized Cost | $ 2,127 | $ 2,067 |  |

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