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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, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) (Effective Portion) | $ 9,146 | $ (12,976) | $ 21,337
Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) (Effective Portion) | 834 | 19 | (1,129)
Cost of Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) (Effective Portion) | 4,166 | (8,627) | 15,877
Research and Development [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) (Effective Portion) | 1,646 | (2,059) | 3,127
Selling, General and Administrative [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
Gains (Losses) Reclassified from Other Comprehensive Income (Loss) (Effective Portion) | $ 2,500 | $ (2,309) | $ 3,462

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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=121590274&loc=SL5624171-113959 + Details
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