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Derivative Financial Instruments - Effect of Non-Designated as Hedging Instruments (Detail) - USD ($) $ in Thousands | 12 Months Ended
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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 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) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5618551-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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