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Derivative Financial Instruments - Effect of Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, (Loss) Gain [Line Items]
(Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion)	$ (12,976)	$ 21,337	$ 28,349
Revenue [Member]
Derivative Instruments, (Loss) Gain [Line Items]
(Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion)	19	(1,129)	(1,021)
Cost of Revenue [Member]
Derivative Instruments, (Loss) Gain [Line Items]
(Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion)	(8,627)	15,877	21,783
Research and Development [Member]
Derivative Instruments, (Loss) Gain [Line Items]
(Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion)	(2,059)	3,127	4,282
Selling, General and Administrative [Member]
Derivative Instruments, (Loss) Gain [Line Items]
(Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion)	$ (2,309)	$ 3,462	$ 3,305

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- Definition

The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959

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