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Derivative Financial Instruments - Effect of Cash Flow 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) Reclassified from Other Comprehensive (Loss) Income (Effective Portion) | $ 21,337 | $ 28,349 | $ (4,141)
Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from Other Comprehensive (Loss) Income (Effective Portion) | (1,129) | (1,021) | (192)
Cost of Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from Other Comprehensive (Loss) Income (Effective Portion) | 15,877 | 21,783 | (2,131)
Research and Development [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from Other Comprehensive (Loss) Income (Effective Portion) | 3,127 | 4,282 | (643)
Selling, General and Administrative [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains (Losses) Reclassified from Other Comprehensive (Loss) Income (Effective Portion) | $ 3,462 | $ 3,305 | $ (1,175)

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- Definition The amount of net gains or losses on foreign currency cash flow hedges reclassified during the period to earnings from accumulated other comprehensive income upon the hedged transaction affecting earnings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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