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Accumulated Other Comprehensive Loss (Table Text Block) | 6 Months Ended
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Sep. 30, 2025 | Sep. 30, 2024
Table Text Block Supplement [Abstract] |  |
Summary of Accumulated Other Comprehensive Income (Loss) Components, Net of Tax |
|  | Foreign Currency Translation |  |  | Unrealized Net Gains (Losses) on Investments and Impact of LFPB (a) Discount Rates |  |  | Fair Value of Cash Flow Hedges |  |  | Postretirement Benefit Obligation Net Loss |  |  | Accumulated Other Comprehensive Loss |
|  | (Unaudited) |
|  | (In thousands) |
Balance as of March 31, 2025 |  | $ | (57,540 | ) |  | $ | (174,320 | ) |  | $ | (56 | ) |  | $ | 2,602 |  |  | $ | (229,314 | )
Foreign currency translation |  |  | 961 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 961 |
Unrealized net gains (losses) on investments and future policy benefits discount rate remeasurement |  |  | — |  |  |  | 39,434 |  |  |  | — |  |  |  | — |  |  |  | 39,434 |
Change in fair value of cash flow hedges |  |  | — |  |  |  | — |  |  |  | (4,437 | ) |  |  | — |  |  |  | (4,437 | )
Amounts reclassified into earnings on hedging activities |  |  | — |  |  |  | — |  |  |  | 3,552 |  |  |  | — |  |  |  | 3,552 |
Other comprehensive income (loss) |  |  | 961 |  |  |  | 39,434 |  |  |  | (885 | ) |  |  | — |  |  |  | 39,510 |
Balance as of September 30, 2025 |  | $ | (56,579 | ) |  | $ | (134,886 | ) |  | $ | (941 | ) |  | $ | 2,602 |  |  | $ | (189,804 | )
|  | Foreign Currency Translation |  |  | Unrealized Net Gains (Losses) on Investments and Impact of LFPB (a) Discount Rates |  |  | Fair Value of Cash Flow Hedges |  |  | Postretirement Benefit Obligation Net Loss |  |  | Accumulated Other Comprehensive Loss |
|  | (Unaudited) |
|  | (In thousands) |
Balance as of March 31, 2024 |  | $ | (53,707 | ) |  | $ | (176,883 | ) |  | $ | 6,330 |  |  | $ | 1,044 |  |  | $ | (223,216 | )
Foreign currency translation |  |  | 217 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 217 |
Unrealized net gains (losses) on investments and future policy benefits discount rate remeasurement |  |  | — |  |  |  | (9,445 | ) |  |  | — |  |  |  | — |  |  |  | (9,445 | )
Change in fair value of cash flow hedges |  |  | — |  |  |  | — |  |  |  | (209 | ) |  |  | — |  |  |  | (209 | )
Amounts reclassified into earnings on hedging activities |  |  | — |  |  |  | — |  |  |  | (8,178 | ) |  |  | — |  |  |  | (8,178 | )
Other comprehensive income (loss) |  |  | 217 |  |  |  | (9,445 | ) |  |  | (8,387 | ) |  |  | — |  |  |  | (17,615 | )
Balance as of September 30, 2024 |  | $ | (53,490 | ) |  | $ | (186,328 | ) |  | $ | (2,057 | ) |  | $ | 1,044 |  |  | $ | (240,831 | )

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