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Income Taxes - Additional Information (Details) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance | $ 37,969,000 |  | $ 37,164,000 |
Deferred tax asset | 150,309,000 |  | 126,219,000 |
Liability related to tax receivable agreement | 98,956,000 |  | 69,636,000 |
Net change in valuation allowance | 805,000 |  |  |
Unrecognized tax positions | 0 |  | 0 | $ 0
Foreign Tax Authority |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Net operating loss carryforwards | 6,902,000 |  | 7,999,000 |
TRA Recipients | Tax Receivable Agreement |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Liability related to tax receivable agreement | 98,956,000 |  | 69,636,000 |
TRA payment | 1,952,000 |  |  |
Additional estimated payable | 10,589,000 |  |  |
Net Operating Loss Carryforwards |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance | 768,000 |  | $ 947,000 |
Deferred Tax Asset, September 2019 Offering |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Valuation allowance | 3,736,000 |  |  |
Deferred tax asset |  | $ 37,394,000 |  |
Deferred Tax Asset, September 2019 Offering | Tax Receivable Agreement |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |
Liability related to tax receivable agreement | $ 31,481,000 |  |  |

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