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Comprehensive Income (Loss) (Accumulated other comprehensive income (loss) components of net of tax) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2019 |  |  | $ (66,698) |
Foreign currency translation | $ (692) | $ (4,101) | 2,919 | $ (5,081)
Unrealized net gain on investments | 22,378 |  | 104,471 |
Change in fair value of cash flow hedges | 361 | 57 |  | 528
Amount reclassified from AOCI |  |  | (2) | 23
Balance as of June 30, 2019 | 39,517 |  | 39,517 |
Foreign Currency Translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2019 |  |  | (56,612) |
Foreign currency translation |  |  | 2,919 |
Unrealized net gain on investments |  |  | 0 |
Change in fair value of cash flow hedges |  |  | 0 |
Amount reclassified from AOCI |  |  | 0 |
Other comprehensive income (loss) |  |  | 2,919 |
Balance as of June 30, 2019 | (53,693) |  | (53,693) |
Unrealized Net Gain on Investments [Member] |  |  |  |
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 gain on investments |  |  | 104,471 |
Change in fair value of cash flow hedges |  |  | 0 |
Amount reclassified from AOCI |  |  | 0 |
Other comprehensive income (loss) |  |  | 104,471 |
Balance as of June 30, 2019 | 97,212 |  | 97,212 |
Fair Market Value of Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2019 |  |  | 107 |
Foreign currency translation |  |  | 0 |
Unrealized net gain on investments |  |  | 0 |
Change in fair value of cash flow hedges |  |  | (1,173) |
Amount reclassified from AOCI |  |  | (2) |
Other comprehensive income (loss) |  |  | (1,175) |
Balance as of June 30, 2019 | (1,068) |  | (1,068) |
Postretirement Benefit Obligation Gain [Member] |  |  |  |
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 | 0
Unrealized net gain on investments | 0 | 0 | 0 | 0
Change in fair value of cash flow hedges | 0 | 0 | 0 | 0
Amount reclassified from AOCI | 0 | 0 | 0 | 0
Other comprehensive income (loss) |  |  | 0 |
Balance as of June 30, 2019 | (2,934) |  | (2,934) |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2019 |  |  | (66,698) |
Foreign currency translation | (692) | (4,101) | 2,919 | (5,081)
Unrealized net gain on investments | 22,378 | (8,281) | 104,471 | (55,830)
Change in fair value of cash flow hedges | 361 | 57 | (1,173) | 528
Amount reclassified from AOCI | 319 | $ (144) | (2) | $ 23
Other comprehensive income (loss) |  |  | 106,215 |
Balance as of June 30, 2019 | $ 39,517 |  | $ 39,517 |

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