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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
--- | ---
Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |
Balance as of March 31, 2023 | $ 223,216 |
Foreign currency translation | 204 | $ 469
Unrealized net gain on investments | 5,413 | 20,344
Change in fair value of cash flow hedges | 1,905 | 3,842
Amount reclassified from AOCI | 1,075 | 868
Other comprehensive income (loss) | 8,597 | 23,787
Balance as of June 30, 2024 | 231,813 |
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 | 204 | 469
Other comprehensive income (loss) | 204 | 469
Balance as of June 30, 2024 | 53,911 | 56,070
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 | 5,413 | 20,344
Other comprehensive income (loss) | 5,413 | 20,344
Balance as of June 30, 2024 | 182,296 | 212,396
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 | 1,905 | 3,842
Amount reclassified from AOCI | 1,075 | 868
Other comprehensive income (loss) | 2,980 | 2,974
Balance as of June 30, 2024 | 3,350 | 6,981
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
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 | 204 | 469
Unrealized net gain on investments | 5,413 | 20,344
Change in fair value of cash flow hedges | 1,905 | 3,842
Amount reclassified from AOCI | 1,075 | 868
Other comprehensive income (loss) | 8,597 | 23,787
Balance as of June 30, 2024 | $ 231,813 | $ 261,836

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