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Accumulated Other Comprehensive Income Loss (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Balance as of March 31, 2019 | $ (66,698) |  |
Foreign currency translation | 9,377 | $ (1,759) | $ 14,652
Unrealized net loss on investments | 97,943 |  | 20,104
Change in fair value of cash flow hedges |  |  | 3,082
Amounts reclassified into earnings on hedging activities | (401) | 789 | 3,893
Change in postretirement benfit obligations | 333 | (1,025) | 35
Other comprehensive income (loss) | 101,350 | (62,075) | 37,873
Balance as of March 31, 2020 | 34,652 | (66,698) |
Foreign Currency Translation |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Balance as of March 31, 2019 | (56,612) |  |
Foreign currency translation | 9,377 |  |
Unrealized net loss on investments | 0 |  |
Change in fair value of cash flow hedges | 0 |  |
Amounts reclassified into earnings on hedging activities | 0 |  |
Change in postretirement benfit obligations | 0 |  |
Other comprehensive income (loss) | 9,377 |  |
Balance as of March 31, 2020 | (47,235) | (56,612) |
Unrealized Gain (Loss) on Investments |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Balance as of March 31, 2019 | (7,259) |  |
Foreign currency translation | 0 |  |
Unrealized net loss on investments | 97,943 |  |
Change in fair value of cash flow hedges | 0 |  |
Amounts reclassified into earnings on hedging activities | 0 |  |
Change in postretirement benfit obligations | 0 |  |
Other comprehensive income (loss) | 97,943 |  |
Balance as of March 31, 2020 | 90,684 | (7,259) |
Fair Market Value of Cash Flow Hedges |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Balance as of March 31, 2019 | 107 |  |
Foreign currency translation | 0 |  |
Unrealized net loss on investments | 0 |  |
Change in fair value of cash flow hedges | (6,301) |  |
Amounts reclassified into earnings on hedging activities | (2) |  |
Change in postretirement benfit obligations | 0 |  |
Other comprehensive income (loss) | (6,303) |  |
Balance as of March 31, 2020 | (6,196) | 107 |
Postretirement Benefit Obligation Gain (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Balance as of March 31, 2019 | (2,934) |  |
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 |  |
Change in postretirement benfit obligations |  | 0 | 0
Other comprehensive income (loss) | 333 |  |
Balance as of March 31, 2020 | (2,601) | (2,934) |
Accumulated Other Comprehensive Income (Loss) |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |
Balance as of March 31, 2019 | (66,698) |  |
Foreign currency translation | 9,377 | (1,759) | 14,652
Unrealized net loss on investments | 97,943 | (50,044) | 20,104
Change in fair value of cash flow hedges |  | 477 | 3,082
Amounts reclassified into earnings on hedging activities | (2) |  |
Change in postretirement benfit obligations | 333 | (1,025) | $ 35
Other comprehensive income (loss) | 101,350 |  |
Balance as of March 31, 2020 | $ 34,652 | $ (66,698) |

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