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Derivative Financial Instruments - Gains (Losses) on Derivative Financial Instruments Recorded in Consolidated Statements of Income (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020
Foreign currency forward contracts |  |  |  |
Derivative [Line Items] |  |  |  |
Gains (losses) on foreign currency forward contracts | $ 1,229 | $ (2,194) | $ 2,915 | $ (1,049)

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- Definition Aggregate net gain (loss) on all derivative instruments recognized in earnings during the period, before tax effects. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5618551-113959 + Details
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