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Comprehensive Income (Loss) (Accumulated other comprehensive income (loss) components of net of tax) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2019 |  |  | $ (66,698) |
Foreign currency translation | $ 629 | $ 1,113 | 3,611 | $ (980)
Unrealized net gain on investments | 41,305 | (17,601) | 82,093 |
Change in fair value of cash flow hedges | (633) | 360 |  | 1,283
Amount reclassified from AOCI |  |  | (321) | (645)
Balance as of June 30, 2019 | 17,151 |  | 17,151 |
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 |  |  | 3,611 |
Unrealized net gain on investments |  |  | 0 |
Change in fair value of cash flow hedges |  |  | 0 |
Amount reclassified from AOCI |  |  |  |
Other comprehensive income (loss) |  |  | 3,611 |
Balance as of June 30, 2019 | (53,001) |  | (53,001) |
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 |  |  | 82,093 |
Change in fair value of cash flow hedges |  |  | 0 |
Amount reclassified from AOCI |  |  |  |
Other comprehensive income (loss) |  |  | 82,093 |
Balance as of June 30, 2019 | 74,834 |  | 74,834 |
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 |  |  | (1,534) |
Amount reclassified from AOCI |  |  | (321) |
Other comprehensive income (loss) |  |  | (1,855) |
Balance as of June 30, 2019 | (1,748) |  | (1,748) |
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 |  |  |  |
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 | 629 | 1,113 | 3,611 | (980)
Unrealized net gain on investments | 41,305 | (17,601) | 82,093 | (57,273)
Change in fair value of cash flow hedges | (633) | 360 | (1,534) | 1,283
Amount reclassified from AOCI | (277) | $ (144) | (321) | $ (645)
Other comprehensive income (loss) |  |  | 83,849 |
Balance as of June 30, 2019 | $ 17,151 |  | $ 17,151 |

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