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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, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2017 |  |  | $ (51,236) |
Foreign currency translation | $ 12,767 | $ (1,704) | 21,034 | $ (1,982)
Unrealized net gain on investments | 10,057 | 20,013 | 16,968 | 39,401
Change in fair value of cash flow hedges | 740 | 1,926 | 1,700 | 3,216
Amount reclassified from AOCI |  |  | 2,618 | 5,107
Other comprehensive income (loss) | 148,203 | $ 196,710 | 290,548 | $ 364,283
Balance as of September 30, 2017 | (11,534) |  | (11,534) |
Foreign Currency Translation [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2017 |  |  | (69,505) |
Foreign currency translation |  |  | 21,034 |
Unrealized net gain on investments |  |  |  |
Change in fair value of cash flow hedges |  |  |  |
Amount reclassified from AOCI |  |  |  |
Other comprehensive income (loss) |  |  | 21,034 |
Balance as of September 30, 2017 | (48,471) |  | (48,471) |
Unrealized Net Gain on Investments [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2017 |  |  | 23,099 |
Foreign currency translation |  |  |  |
Unrealized net gain on investments |  |  | 16,968 |
Change in fair value of cash flow hedges |  |  |  |
Amount reclassified from AOCI |  |  |  |
Other comprehensive income (loss) |  |  | 16,968 |
Balance as of September 30, 2017 | 40,067 |  | 40,067 |
Fair Market Value of Cash Flow Hedges [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2017 |  |  | (3,059) |
Foreign currency translation |  |  |  |
Unrealized net gain on investments |  |  |  |
Change in fair value of cash flow hedges |  |  | 4,318 |
Amount reclassified from AOCI |  |  | (2,618) |
Other comprehensive income (loss) |  |  | 1,700 |
Balance as of September 30, 2017 | (1,359) |  | (1,359) |
Postretirement Benefit Obligation Gain [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2017 |  |  | (1,771) |
Foreign currency translation |  |  |  |
Unrealized net gain on investments |  |  |  |
Change in fair value of cash flow hedges |  |  |  |
Amount reclassified from AOCI |  |  |  |
Other comprehensive income (loss) |  |  |  |
Balance as of September 30, 2017 | (1,771) |  | (1,771) |
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |  |
Accumulated Other Comprehensive Income (Loss) Components, Net of Tax [Roll Forward] |  |  |  |
Balance as of March 31, 2017 |  |  | (51,236) |
Foreign currency translation |  |  | 21,034 |
Unrealized net gain on investments |  |  | 16,968 |
Change in fair value of cash flow hedges |  |  | 4,318 |
Amount reclassified from AOCI |  |  | (2,618) |
Other comprehensive income (loss) |  |  | 39,702 |
Balance as of September 30, 2017 | $ (11,534) |  | $ (11,534) |

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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