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Derivative Financial Instruments - Effect of Non-Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Recognized in Income	$ (2,042)	$ 6,026	$ 2,356
Cost of Revenue [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Recognized in Income	(718)	401	(4,577)
Research and Development [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Recognized in Income	(341)	14	(736)
Selling, General and Administrative [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Recognized in Income	(559)	294	(950)
Interest and Other Expense, Net [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Recognized in Income	255	5,845	7,038
Income Taxes [Member]
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) Gains Recognized in Income	$ (679)	$ (528)	$ 1,581

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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
-Subparagraph (b)
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-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5624171-113959

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