Derivatives and Hedging Activities - Cross Currency Swaps (Details) - Net investment hedges - Designated as Hedging Instrument - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
Jun. 30, 2025	Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	$ 126,392	$ 146,392
Unrealized Gains (Losses) Recognized in AOCI	(13,347)	(6,379)
USD Euro Exchange Future
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	81,392	81,392
Unrealized Gains (Losses) Recognized in AOCI	(5,786)	(5,440)
USD Sweden Exchange Future
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	20,000	20,000
Unrealized Gains (Losses) Recognized in AOCI	(2,683)	(468)
USD Singapore Exchange Future
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	0	20,000
Unrealized Gains (Losses) Recognized in AOCI	0	(441)
USD Euro Exchange Future
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	25,000	25,000
Unrealized Gains (Losses) Recognized in AOCI	(4,878)	(30)
USD Canadian Exchange Future
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notional amount	0	0
Unrealized Gains (Losses) Recognized in AOCI	0	0
Cross-Currency Swaps
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Net investment hedge, gain (loss), after reclassification, tax	$ (4,506)	$ (2,156)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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