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Derivative Financial Instruments - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Derivative [Line Items] |  |  |  |
Gain (Loss) on Foreign Currency Derivative Instruments Not Designated as Hedging Instruments, Net | $ (0.6) | $ 1.1 | $ (2.5) | $ 0.0
Maximum | Forward contracts | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, remaining maturity | 3 months |  | 3 months |
Maximum | Forward contracts | Designated as Hedging Instrument | Net Investment Hedging |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, remaining maturity | 3 months |  | 3 months |
Maximum | Options | Not Designated as Hedging Instrument |  |  |  |
Derivative [Line Items] |  |  |  |
Derivative, remaining maturity | 14 months |  | 14 months |

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- Definition Amount of gain (loss) recognized in earnings in the period from the increase (decrease) in fair value of foreign currency derivatives not designated as hedging instruments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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/2009/role/commonPracticeRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4A -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4A + Details
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