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Derivative Financial Instruments - Effect of Non-Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2015
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	$ (4,848)	$ (7,786)	$ 20,986
Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income		(67)	339
Cost of Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	4,639	2,187	(8,668)
Research and Development [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	957	284	(830)
Selling, General and Administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	1,723	560	(1,827)
Interest and Other (Expense) Income, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	(10,514)	(9,674)	30,150
Income Taxes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	$ (1,653)	$ (1,076)	$ 1,822

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments.

+ 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 (e)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

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