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Derivative Financial Instruments - Fair Value of Open Foreign Currency Exchange Contracts (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Sep. 30, 2015
Derivatives, Fair Value [Line Items]
Net fair value	$ 16,067	$ (13,097)
Foreign Exchange Contracts [Member]
Derivatives, Fair Value [Line Items]
Net fair value	16,067	(13,097)
Foreign Exchange Contracts [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Net fair value	16,457	(14,466)
Foreign Exchange Contracts [Member] | Derivatives Not Designated as Hedging Instruments [member]
Derivatives, Fair Value [Line Items]
Net fair value	(390)	1,369
Foreign Exchange Contracts [Member] | Prepaid Expenses and Other Current Assets [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	12,780	3,631
Foreign Exchange Contracts [Member] | Prepaid Expenses and Other Current Assets [Member] | Derivatives Not Designated as Hedging Instruments [member]
Derivatives, Fair Value [Line Items]
Derivative Asset	3,516	4,508
Foreign Exchange Contracts [Member] | Other Noncurrent Assets [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset	4,545	533
Foreign Exchange Contracts [Member] | Accrued Expenses and Other Current Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(501)	(14,640)
Foreign Exchange Contracts [Member] | Accrued Expenses and Other Current Liabilities [Member] | Derivatives Not Designated as Hedging Instruments [member]
Derivatives, Fair Value [Line Items]
Derivative Liability	(3,906)	(3,139)
Foreign Exchange Contracts [Member] | Other Noncurrent Liabilities [Member] | Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Derivative Liability	$ (367)	$ (3,990)

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 20
-Section 55
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959

Reference 4: http://www.xbrl.org/2003/role/presentationRef
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-Topic 210
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-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

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X

- 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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=d3e41678-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958

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Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
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-Section 50
-Paragraph 10
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-Topic 825
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-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13495-108611

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