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Fair Value Measurements - Additional Information (Detail) | Sep. 30, 2020 USD ($) | Sep. 30, 2020 CAD ($) | Sep. 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
Foreign Exchange Forward | Canada, Dollars |  |  |
Derivative [Line Items] |  |  |
Derivative, notional amount |  | $ 24,000,000.0 |

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