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Fair Value Measurements - Additional Information (Detail) | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) unit_Contract | Jun. 30, 2020 CAD ($) unit_Contract | Jun. 30, 2020 GBP (£) unit_Contract | Jun. 30, 2019 USD ($)
Derivative [Line Items] |  |  |  |
Significant transfers from level 1 to level 2 | $ 0 |  |  | $ 0
Significant transfers from level 2 to level 1 | $ 0 |  |  | $ 0
British pound forward contracts | unit_Contract | 4 | 4 | 4 |
Foreign Exchange Forward | Canada, Dollars |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount |  | $ 24,000,000.0 |  |
Fair value unrealized gain (loss) | $ 100,000 |  |  |
Foreign Exchange Forward | United Kingdom, Pounds |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, notional amount | £ |  |  | £ 40,000,000.0 |
Fair value unrealized gain (loss) | $ 800,000 |  |  |

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