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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, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (losses) Recognized in Income | $ 6,026 | $ 2,356 | $ (4,848)
Cost of Revenue [Member] |  |  |
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (losses) Recognized in Income | 401 | (4,577) | 4,639
Research and Development [Member] |  |  |
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (losses) Recognized in Income | 14 | (736) | 957
Selling, General and Administrative [Member] |  |  |
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (losses) Recognized in Income | 294 | (950) | 1,723
Interest and Other Income (Expense), Net [Member] |  |  |
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (losses) Recognized in Income | 5,845 | 7,038 | (10,514)
Income Taxes [Member] |  |  |
Derivative Instruments, (Loss) Gain [Line Items] |  |  |
Gains (losses) Recognized in Income | $ (528) | $ 1,581 | $ (1,653)

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