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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)

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