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Derivative Financial Instruments - Effect of Non-Designated as 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) Recognized in Income	$ 2,356	$ (4,848)	$ (7,786)
Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income			(67)
Cost of Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	(4,577)	4,639	2,187
Research and Development [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	(736)	957	284
Selling, General and Administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	(950)	1,723	560
Interest and Other (Expense) Income, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	7,038	(10,514)	(9,674)
Income Taxes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) Recognized in Income	$ 1,581	$ (1,653)	$ (1,076)

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- Definition

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
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