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Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | $ 46,384 |  |
Foreign currency translation | (782) | $ (2,828) | $ (5,694)
Unrealized net loss on investments | (319,190) | (62,626) | 76,969
Amounts reclassified into earnings on hedging activities | (582) | 2,978 | 2,746
Change in post retirement benefit obligations | 2,091 | 1,546 | (1,387)
Other comprehensive income (loss) | (313,430) | (60,473) | 72,205
Ending balance as of March 31 | (267,046) | 46,384 |
Foreign Currency Translation |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | (55,757) | (52,929) | (47,235)
Foreign currency translation | (782) | (2,828) | (5,694)
Unrealized net loss on investments | 0 | 0 | 0
Change in fair value of cash flow hedges | 0 | 0 | 0
Amounts reclassified into earnings on hedging activities | 0 | 0 | 0
Change in post retirement benefit obligations | 0 | 0 | 0
Other comprehensive income (loss) | (782) | (2,828) | (5,694)
Ending balance as of March 31 | (56,539) | (55,757) | (52,929)
Unrealized Gain (Loss) on Investments |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | 105,027 | 167,653 | 90,684
Foreign currency translation | 0 | 0 | 0
Unrealized net loss on investments | (319,190) | (62,626) | 76,969
Change in fair value of cash flow hedges | 0 | 0 | 0
Amounts reclassified into earnings on hedging activities | 0 | 0 | 0
Change in post retirement benefit obligations | 0 | 0 | 0
Other comprehensive income (loss) | (319,190) | (62,626) | 76,969
Ending balance as of March 31 | (214,163) | 105,027 | 167,653
Fair Market Value of Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | (444) | (3,879) | (6,196)
Foreign currency translation | 0 | 0 | 0
Unrealized net loss on investments | 0 | 0 | 0
Change in fair value of cash flow hedges | 5,033 | 457 | (429)
Amounts reclassified into earnings on hedging activities | (582) | 2,978 | 2,746
Change in post retirement benefit obligations | 0 | 0 | 0
Other comprehensive income (loss) | 4,451 | 3,435 | 2,317
Ending balance as of March 31 | 4,007 | (444) | (3,879)
Postretirement Benefit Obligation Gain (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | (2,442) | (3,988) | (2,601)
Foreign currency translation | 0 | 0 | 0
Unrealized net loss on investments | 0 | 0 | 0
Change in fair value of cash flow hedges | 0 | 0 | 0
Amounts reclassified into earnings on hedging activities | 0 | 0 | 0
Change in post retirement benefit obligations | 2,091 | 1,546 | (1,387)
Other comprehensive income (loss) | 2,091 | 1,546 | (1,387)
Ending balance as of March 31 | (351) | (2,442) | (3,988)
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Beginning balance as of March 31 | 46,384 | 106,857 | 34,652
Foreign currency translation | (782) | (2,828) | (5,694)
Unrealized net loss on investments | (319,190) | (62,626) | 76,969
Change in fair value of cash flow hedges | 5,033 | 457 | (429)
Amounts reclassified into earnings on hedging activities | (582) | 2,978 | 2,746
Change in post retirement benefit obligations | 2,091 | 1,546 | (1,387)
Other comprehensive income (loss) | (313,430) | (60,473) | 72,205
Ending balance as of March 31 | $ (267,046) | $ 46,384 | $ 106,857

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