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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 | 9 Months Ended
--- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2024 | Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2024 |  |  | $ 223,216 |
Foreign currency translation | $ 3,929 | $ 5,268 | 3,712 | $ 2,888
Unrealized net gain on investments | 54,108 | 32,785 | 44,663 | 25,738
Change in fair value of cash flow hedges | 4,611 | 4,352 | 4,402 | 2,823
Amount reclassified from AOCI | 1,197 | 1,109 | 9,375 | 2,992
Other comprehensive income (loss) | 53,593 | 32,978 | 35,978 | 23,019
Balance as of December 31, 2024 | 187,238 |  | 187,238 |
Foreign Currency Translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2024 | 53,490 | 58,919 | 53,707 | 56,539
Foreign currency translation | 3,929 | 5,268 | 3,712 | 2,888
Other comprehensive income (loss) | 3,929 | 5,268 | 3,712 | 2,888
Balance as of December 31, 2024 | 57,419 | 53,651 | 57,419 | 53,651
Unrealized Net Gain on Investments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2024 | 186,328 | 225,693 | 176,883 | 232,740
Unrealized net gain on investments | 54,108 | 32,785 | 44,663 | 25,738
Other comprehensive income (loss) | 54,108 | 32,785 | 44,663 | 25,738
Balance as of December 31, 2024 | 132,220 | 258,478 | 132,220 | 258,478
Fair Market Value of Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2024 | 2,057 | 9,299 | 6,330 | 4,007
Change in fair value of cash flow hedges | 4,611 | 4,352 | 4,402 | 2,823
Amount reclassified from AOCI | 1,197 | 1,109 | 9,375 | 2,992
Other comprehensive income (loss) | 3,414 | 5,461 | 4,973 | 169
Balance as of December 31, 2024 | 1,357 | 3,838 | 1,357 | 3,838
Postretirement Benefit Obligation Gain [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2024 | 1,044 | 351 | 1,044 | 351
Balance as of December 31, 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, 2024 | 240,831 | 275,664 | 223,216 | 285,623
Foreign currency translation | 3,929 | 5,268 | 3,712 | 2,888
Unrealized net gain on investments | 54,108 | 32,785 | 44,663 | 25,738
Change in fair value of cash flow hedges | 4,611 | 4,352 | 4,402 | 2,823
Amount reclassified from AOCI | 1,197 | 1,109 | 9,375 | 2,992
Other comprehensive income (loss) | 53,593 | 32,978 | 35,978 | 23,019
Balance as of December 31, 2024 | $ 187,238 | $ 308,642 | $ 187,238 | $ 308,642

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