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Derivatives and Hedging Activities - Cross Currency Swaps (Details) - Net investment hedges - Designated as Hedging Instrument - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Sep. 30, 2025
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | $ 126,392 | $ 126,392
Unrealized Losses Recognized in AOCI | (10,083) | (13,703)
USD Euro Exchange Future |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | 81,392 | 81,392
Unrealized Losses Recognized in AOCI | (7,929) | (9,443)
USD Sweden Exchange Future |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | 20,000 | 20,000
Unrealized Losses Recognized in AOCI | (1,730) | (2,571)
USD Euro Exchange Future |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Notional amount | 25,000 | 25,000
Unrealized Losses Recognized in AOCI | (424) | (1,689)
Cross-Currency Swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Net investment hedge, gain (loss), after reclassification, tax | $ (3,376) | $ 4,652

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