Derivative Instruments - Schedule of Derivative Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Sep. 30, 2025
Cross-currency swap \| Net Investment Hedge
Derivative	$ 260,025	$ 260,025
Foreign exchange contracts \| Undesignated
Derivative	$ 42,340	$ 44,603

Nominal or face amount used to calculate payment on derivative.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 181
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480401/815-10-55-181

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 815
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-Section 50
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Period Type:	instant