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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, 2020	Sep. 30, 2019
Derivatives, Fair Value [Line Items]
Net fair value	$ 20,636	$ 7,890
Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Net fair value	20,381	4,880
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Net fair value	255	3,010
Prepaid Expenses and Other Current Assets [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	21,153	9,344
Prepaid Expenses and Other Current Assets [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	3,068	5,086
Other Noncurrent Assets [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	1,317	585
Accrued Expenses and Other Current Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(2,089)	(2,977)
Accrued Expenses and Other Current Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(2,813)	(2,076)
Other Noncurrent Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	$ 0	$ (2,072)

X

- Definition

Fair value, after offset of derivative liability, of financial asset or other 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value of the assets less the liabilities of a derivative or group of derivatives.

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