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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Mar. 31, 2020
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Provision for (benefit from) income taxes | $ 56,301 | $ (2,598) |  | $ 70,304 | $ 3,938 |
Effective income tax rates | 17.40% | (3.70%) |  | 17.20% | 3.20% |
Full statutory income tax rate | 13.63% |  | 13.63% | 13.63% |  |
Transitional income tax benefit |  | $ 5,900 |  |  |  |
Discrete tax benefits from recognition of excess tax benefits |  |  |  | $ 5,800 | $ 6,700 |
Reversal of uncertain tax positions |  |  |  | 1,500 | 1,800 |
Unrecognized tax benefits | $ 152,500 |  |  | 152,500 |  | $ 140,800
Accrued interest and penalties related to uncertain tax positions | 4,800 |  |  | 4,800 |  | 4,500
Expected decrease in uncertain tax positions | 4,700 |  |  | 4,700 |  |
Non-current income tax payable |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Unrecognized tax benefits | $ 54,500 |  |  | $ 54,500 |  | $ 40,800
SWITZERLAND |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |
Tax benefit from remeasurement of deferred income tax and benefit |  | $ 4,000 |  |  | $ 1,700 |

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