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Derivative Financial Instruments - Effect of Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Reclassified from Other Comprehensive (Loss) Income (Effective Portion)	$ 21,337	$ 28,349	$ (4,141)
Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Reclassified from Other Comprehensive (Loss) Income (Effective Portion)	(1,129)	(1,021)	(192)
Cost of Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Reclassified from Other Comprehensive (Loss) Income (Effective Portion)	15,877	21,783	(2,131)
Research and Development [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Reclassified from Other Comprehensive (Loss) Income (Effective Portion)	3,127	4,282	(643)
Selling, General and Administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (Losses) Reclassified from Other Comprehensive (Loss) Income (Effective Portion)	$ 3,462	$ 3,305	$ (1,175)

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No definition available.

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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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