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Derivative Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Notional Amounts of Outstanding Derivative Positions | The following tables summarize our outstanding foreign currency forward contracts, by currency, at September 30, 2023 and 2022:
| September 30, 2023
| Contract Amount |  | Fair Value
| Foreign Currency |  | USD |  | USD
|  | (In thousands)
Sell foreign currency: |  |  |  |  |  |
Euro (EUR) | EUR | 12,900 |  |  | $ | 13,621 |  |  | — |
Buy foreign currency: |  |  |  |  |  |
British pound (GBP) | GBP | 10,700 |  |  | $ | 13,100 |  |  | — |
Singapore dollar (SGD) | SGD | 8,569 |  |  | $ | 6,300 |  |  | — |
| September 30, 2022
| Contract Amount |  | Fair Value
| Foreign Currency |  | USD |  | USD
|  | (In thousands)
Sell foreign currency: |  |  |  |  |  |
Euro (EUR) | EUR | 13,500 |  |  | $ | 13,158 |  |  | — |
Buy foreign currency: |  |  |  |  |  |
British pound (GBP) | GBP | 11,848 |  |  | $ | 13,100 |  |  | — |
Singapore dollar (SGD) | SGD | 6,169 |  |  | $ | 4,300 |  |  | — |
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance |
| Year Ended September 30,
| 2023 |  | 2022 |  | 2021
| (In thousands)
Gain (loss) on foreign currency forward contracts | $ | 1,625 |  |  | $ | (2,748) |  |  | $ | 2,064 |

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- Definition Tabular disclosure of the location and amount of derivative instruments and nonderivative instruments designated as hedging instruments reported before netting adjustments, and the amount of gain (loss) on derivative instruments and nonderivative instruments designated and qualified as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4E Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4C Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480434/815-10-50-4A + Details
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