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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, 2022 | Sep. 30, 2021 | Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion) | $ (16,035) | $ 32,152 | $ 9,146
Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion) | 445 | (473) | 834
Cost of Revenue [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion) | (9,194) | 20,209 | 4,166
Research and Development [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion) | (3,376) | 6,069 | 1,646
Selling, General and Administrative [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Item] |  |  |
(Losses) Gains Reclassified from Accumulated Other Comprehensive (Loss) Income (Effective Portion) | $ (3,910) | $ 6,347 | $ 2,500

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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 https://asc.fasb.org/extlink&oid=125515794&loc=SL5624171-113959 + Details
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