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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Mar. 31, 2019
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Provision for (benefit from) income taxes | $ (2,598) | $ 6,203 | $ 3,938 | $ 986 |
Effective income tax rates | (3.70%) | 8.80% | 3.20% | 1.00% |
Full statutory income tax rate | 13.63% |  |  |  |
Transitional income tax benefit | $ 5,900 |  |  |  |
Discrete tax benefits from reversal of uncertain tax positions | 1,800 | $ 1,400 |  |  |
Unrecognized tax benefits | 78,900 |  | $ 78,900 |  | $ 76,500
Accrued interest and penalties related to uncertain tax positions | 2,800 |  | 2,800 |  | $ 2,500
Expected decrease in uncertain tax positions | 3,700 |  | 3,700 |  |
Non-current income tax payable |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Unrecognized tax benefits | 36,400 |  | 36,400 |  |
UNITED STATES |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Discrete tax benefits from recognition of excess tax benefits in the United States | 6,700 | $ 9,000 |  |  |
Switzerland |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax benefit from remeasurement of deferred income tax and benefit | $ 4,000 |  | $ 1,700 |  |

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