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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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No definition available.

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Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Section 50
-Paragraph 1A
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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-SubTopic 10
-Section 50
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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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