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Accumulated Other Comprehensive Loss (Summary of Accumulated Other Comprehensive Income (Loss) Components, Net of Tax) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2023 |  |  | $ 223,216 |
Foreign currency translation | $ 421 | $ 2,849 | 217 | $ 2,380
Unrealized net gain on investments | 4,032 | 13,297 | 9,445 | 7,047
Change in fair value of cash flow hedges | 1,696 | 3,333 | 209 | 7,175
Amount reclassified from AOCI | 7,103 | 1,015 | 8,178 | 1,883
Other comprehensive income (loss) | 9,018 | 13,828 | 17,615 | 9,959
Balance as of June 30, 2024 | 240,831 |  | 240,831 |
Foreign Currency Translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2023 |  |  | 53,707 | 56,539
Foreign currency translation |  |  | 217 | 2,380
Other comprehensive income (loss) |  |  | 217 | 2,380
Balance as of June 30, 2024 | 53,490 | 58,919 | 53,490 | 58,919
Unrealized Net Gain on Investments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2023 |  |  | 176,883 | 232,740
Unrealized net gain on investments |  |  | 9,445 | 7,047
Other comprehensive income (loss) |  |  | 9,445 | 7,047
Balance as of June 30, 2024 | 186,328 | 225,693 | 186,328 | 225,693
Fair Market Value of Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2023 |  |  | 6,330 | 4,007
Change in fair value of cash flow hedges |  |  | 209 | 7,175
Amount reclassified from AOCI |  |  | 8,178 | 1,883
Other comprehensive income (loss) |  |  | 8,387 | 5,292
Balance as of June 30, 2024 | 2,057 | 9,299 | 2,057 | 9,299
Postretirement Benefit Obligation Gain [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2023 |  |  | 1,044 | 351
Balance as of June 30, 2024 | 1,044 | 351 | 1,044 | 351
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2023 |  |  | 223,216 | 285,623
Foreign currency translation | 421 | 2,849 | 217 | 2,380
Unrealized net gain on investments | 4,032 | 13,297 | 9,445 | 7,047
Change in fair value of cash flow hedges | 1,696 | 3,333 | 209 | 7,175
Amount reclassified from AOCI | 7,103 | 1,015 | 8,178 | 1,883
Other comprehensive income (loss) |  |  | 17,615 | 9,959
Balance as of June 30, 2024 | $ 240,831 | $ 275,664 | $ 240,831 | $ 275,664

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