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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, 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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- 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=121590274&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=121590274&loc=SL5624171-113959 + Details
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