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Income Taxes - Balance Sheet Location of Unrecognized Tax Benefits (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2016
--- | --- | --- | --- | ---
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | $ 10,942 | $ 9,594 | $ 11,727 | $ 8,695
Deferred tax assets, net |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | 486 | 0 |  |
Income taxes payable |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | 7 | 0 |  |
Income tax liability |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Unrecognized tax benefits | $ 10,449 | $ 9,594 |  |

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