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Accumulated Other Comprehensive Income (Loss) (Summary of Accumulated Other Comprehensive Income (Loss) Components, Net of Tax) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Mar. 31, 2022
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | $ 285,623 |  | $ 106,857
Foreign currency translation | 2,832 | $ 782 | 2,828
Unrealized net loss on investments | 55,857 | 289,477 | 46,378
Change in fair value of cash flow hedges | 6,410 | 5,033 | 457
Amounts reclassified into earnings on hedging activities | 4,087 | 582 | 2,978
Change in post retirement benefit obligations | 1,395 | 2,091 | 1,546
Other comprehensive income (loss) | 62,407 | 283,717 | 44,225
Ending balance as of March 31 | 223,216 | 285,623 |
Foreign Currency Translation [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | 56,539 | 55,757 | 52,929
Foreign currency translation | 2,832 | 782 | 2,828
Other comprehensive income (loss) | 2,832 | 782 | 2,828
Ending balance as of March 31 | 53,707 | 56,539 | 55,757
Unrealized Net Gains (Losses) on Investments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | 232,740 | 56,737 | 167,653
Unrealized net loss on investments | 55,857 | 289,477 | 46,378
Other comprehensive income (loss) | 55,857 | 289,477 | 46,378
Ending balance as of March 31 | 176,883 | 232,740 | 56,737
Fair Market Value of Cash Flow Hedges [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | 4,007 | 444 | 3,879
Change in fair value of cash flow hedges | 6,410 | 5,033 | 457
Amounts reclassified into earnings on hedging activities | 4,087 | 582 | 2,978
Other comprehensive income (loss) | 2,323 | 4,451 | 3,435
Ending balance as of March 31 | 6,330 | 4,007 | 444
Postretirement Benefit Obligation Net Loss [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | 351 | 2,442 | 3,988
Change in post retirement benefit obligations | 1,395 | 2,091 | 1,546
Other comprehensive income (loss) | 1,395 | 2,091 | 1,546
Ending balance as of March 31 | 1,044 | 351 | 2,442
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | 285,623 | 1,906 | 106,857
Foreign currency translation | 2,832 | 782 | 2,828
Unrealized net loss on investments | 55,857 | 289,477 | 46,378
Change in fair value of cash flow hedges | 6,410 | 5,033 | 457
Amounts reclassified into earnings on hedging activities | 4,087 | 582 | 2,978
Change in post retirement benefit obligations | 1,395 | 2,091 | 1,546
Other comprehensive income (loss) | 62,407 | 283,717 | 44,225
Ending balance as of March 31 | $ 223,216 | $ 285,623 | 1,906
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 |  |  | 64,538
Cumulative Effect, Period of Adoption, Adjustment [Member] | Unrealized Net Gains (Losses) on Investments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 |  |  | 64,538
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 |  |  | 17,156
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Unrealized Net Gains (Losses) on Investments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 |  |  | 103,115
Cumulative Effect, Period of Adoption, Adjusted Balance [Member] | Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 |  |  | $ 42,319

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