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Derivative Financial Instruments (Tables) | 12 Months Ended
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Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Schedule of Outstanding Foreign Currency Forward Contracts | The following tables summarize our outstanding foreign currency forward contracts, by currency, at September 30, 2025 and 2024:
| September 30, 2025
| Contract Amount |  | Fair Value
| Foreign Currency |  | USD |  | USD
|  | (In thousands)
Sell foreign currency: |  |  |  |  |  |
Euro (EUR) | EUR | 7,700 |  |  | $ | 9,034 |  |  | — |
Buy foreign currency: |  |  |  |  |  |
British pound (GBP) | GBP | 10,019 |  |  | $ | 13,500 |  |  | — |
Singapore dollar (SGD) | SGD | 8,087 |  |  | $ | 6,300 |  |  | — |
| September 30, 2024
| Contract Amount |  | Fair Value
| Foreign Currency |  | USD |  | USD
|  | (In thousands)
Sell foreign currency: |  |  |  |  |  |
Euro (EUR) | EUR | 13,000 |  |  | $ | 14,531 |  |  | — |
Buy foreign currency: |  |  |  |  |  |
British pound (GBP) | GBP | 12,237 |  |  | $ | 16,400 |  |  | — |
Singapore dollar (SGD) | SGD | 7,404 |  |  | $ | 5,800 |  |  | — |
Schedule of Gains on Derivative Financial Instruments | Gains (losses) on derivative financial instruments were recorded in our consolidated statements of income and comprehensive income as a component of other income, net, and consisted of the following:
| Year Ended September 30,
| 2025 |  | 2024 |  | 2023
| (In thousands)
Gain (loss) on foreign currency forward contracts | $ | (425) |  |  | $ | 1,580 |  |  | $ | 1,625 |

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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 4CC -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4CC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4C -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4C Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A Reference 5: 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 + Details
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- Definition Tabular disclosure of the notional amounts of outstanding derivative positions. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1A -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-1A + Details
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