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Derivative Financial Instruments - Effect of Cash Flow Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion)	$ (4,141)	$ (20,242)	$ 24,091
Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion)	(192)	1,077	539
Cost of Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion)	(2,131)	(13,624)	15,424
Research and Development [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion)	(643)	(3,621)	4,056
Selling, General and Administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Reclassified from Other Comprehensive Income (Loss) (Effective Portion)	$ (1,175)	$ (4,074)	$ 4,072

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+ References

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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