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Accumulated Other Comprehensive Loss (Table Text Block) | 9 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
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 Discount Rates (a) |  |  | Fair Value of Cash Flow Hedges |  |  | Postretirement Benefit Obligation Net Loss |  |  | Accumulated Other Comprehensive Loss |
|  | (Unaudited) |
|  | (In thousands) |
Balance as of September 30, 2024 |  | $ | (53,490 | ) |  | $ | (186,328 | ) |  | $ | (2,057 | ) |  | $ | 1,044 |  |  | $ | (240,831 | )
Foreign currency translation |  |  | (3,929 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,929 | )
Unrealized net gain on investments and future policy benefits discount rate remeasurement gains (losses) |  |  | — |  |  |  | 54,108 |  |  |  | — |  |  |  | — |  |  |  | 54,108 |
Change in fair value of cash flow hedges |  |  | — |  |  |  | — |  |  |  | 4,611 |  |  |  | — |  |  |  | 4,611 |
Amounts reclassified into earnings on hedging activities |  |  | — |  |  |  | — |  |  |  | (1,197 | ) |  |  | — |  |  |  | (1,197 | )
Other comprehensive income (loss) |  |  | (3,929 | ) |  |  | 54,108 |  |  |  | 3,414 |  |  |  | — |  |  |  | 53,593 |
Balance as of December 31, 2024 |  | $ | (57,419 | ) |  | $ | (132,220 | ) |  | $ | 1,357 |  |  | $ | 1,044 |  |  | $ | (187,238 | )
|  | Foreign Currency Translation |  |  | Unrealized Net Gains (Losses) on Investments and Impact of LFPB Discount Rates (a) |  |  | 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 |  |  | (3,712 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (3,712 | )
Unrealized net gain on investments and future policy benefits discount rate remeasurement gains (losses) |  |  | — |  |  |  | 44,663 |  |  |  | — |  |  |  | — |  |  |  | 44,663 |
Change in fair value of cash flow hedges |  |  | — |  |  |  | — |  |  |  | 4,402 |  |  |  | — |  |  |  | 4,402 |
Amounts reclassified into earnings on hedging activities |  |  | — |  |  |  | — |  |  |  | (9,375 | ) |  |  | — |  |  |  | (9,375 | )
Other comprehensive income (loss) |  |  | (3,712 | ) |  |  | 44,663 |  |  |  | (4,973 | ) |  |  | — |  |  |  | 35,978 |
Balance as of December 31, 2024 |  | $ | (57,419 | ) |  | $ | (132,220 | ) |  | $ | 1,357 |  |  | $ | 1,044 |  |  | $ | (187,238 | )
|  | Foreign Currency Translation |  |  | Unrealized Net Gains (Losses) on Investments and Impact of LFPB Discount Rates (a) |  |  | Fair Value of Cash Flow Hedges |  |  | Postretirement Benefit Obligation Net Loss |  |  | Accumulated Other Comprehensive Loss |
|  | (Unaudited) |
|  | (In thousands) |
Balance as of September 30, 2023 |  | $ | (58,919 | ) |  | $ | (225,693 | ) |  | $ | 9,299 |  |  | $ | (351 | ) |  | $ | (275,664 | )
Foreign currency translation |  |  | 5,268 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 5,268 |
Unrealized net loss on investments and future policy benefits discount rate remeasurement gains (losses) |  |  | — |  |  |  | (32,785 | ) |  |  | — |  |  |  | — |  |  |  | (32,785 | )
Change in fair value of cash flow hedges |  |  | — |  |  |  | — |  |  |  | (4,352 | ) |  |  | — |  |  |  | (4,352 | )
Amounts reclassified into earnings on hedging activities |  |  | — |  |  |  | — |  |  |  | (1,109 | ) |  |  | — |  |  |  | (1,109 | )
Other comprehensive income (loss) |  |  | 5,268 |  |  |  | (32,785 | ) |  |  | (5,461 | ) |  |  | — |  |  |  | (32,978 | )
Balance as of December 31, 2023 |  | $ | (53,651 | ) |  | $ | (258,478 | ) |  | $ | 3,838 |  |  | $ | (351 | ) |  | $ | (308,642 | )
|  | Foreign Currency Translation |  |  | Unrealized Net Gains (Losses) on Investments and Impact of LFPB Discount Rates (a) |  |  | Fair Value of Cash Flow Hedges |  |  | Postretirement Benefit Obligation Net Loss |  |  | Accumulated Other Comprehensive Loss |
|  | (Unaudited) |
|  | (In thousands) |
Balance as of March 31, 2023 |  | $ | (56,539 | ) |  | $ | (232,740 | ) |  | $ | 4,007 |  |  | $ | (351 | ) |  | $ | (285,623 | )
Foreign currency translation |  |  | 2,888 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 2,888 |
Unrealized net loss on investments and future policy benefits discount rate remeasurement gains (losses) |  |  | — |  |  |  | (25,738 | ) |  |  | — |  |  |  | — |  |  |  | (25,738 | )
Change in fair value of cash flow hedges |  |  | — |  |  |  | — |  |  |  | 2,823 |  |  |  | — |  |  |  | 2,823 |
Amounts reclassified into earnings on hedging activities |  |  | — |  |  |  | — |  |  |  | (2,992 | ) |  |  | — |  |  |  | (2,992 | )
Other comprehensive income (loss) |  |  | 2,888 |  |  |  | (25,738 | ) |  |  | (169 | ) |  |  | — |  |  |  | (23,019 | )
Balance as of December 31, 2023 |  | $ | (53,651 | ) |  | $ | (258,478 | ) |  | $ | 3,838 |  |  | $ | (351 | ) |  | $ | (308,642 | )

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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