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Derivative Financial Instruments - Fair Value of Open Foreign Currency Exchange Contracts (Detail) - Foreign Exchange Contracts [Member] - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020
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Derivatives, Fair Value [Line Items] |  |
Net fair value | $ 10,979 | $ 20,636
Derivatives Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net fair value | 9,960 | 20,381
Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Net fair value | 1,019 | 255
Prepaid Expenses and Other Current Assets [Member] | Derivatives Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 6,962 | 21,153
Prepaid Expenses and Other Current Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 4,230 | 3,068
Other Noncurrent Assets [Member] | Derivatives Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Asset | 3,068 | 1,317
Accrued Expenses and Other Current Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | (70) | (2,089)
Accrued Expenses and Other Current Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member] |  |
Derivatives, Fair Value [Line Items] |  |
Derivative Liability | $ (3,211) | $ (2,813)

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- Definition Fair value, after offset of derivative asset, of financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, elected not to be and before offset against a right to receive collateral under a master netting arrangement. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=125515794&loc=d3e41678-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226006-175313 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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