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Derivatives and Hedging Activities - Cross Currency Swaps (Details) - Net investment hedges - Designated as Hedging Instrument - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2024 | Mar. 31, 2025 | Sep. 30, 2024
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional amount |  | $ 171,392 | $ 146,392
Unrealized Gains (Losses) Recognized in AOCI |  | (1,859) | (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 |  | (4,019) | (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 |  | (137) | (468)
USD Singapore Exchange Future |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional amount |  | 20,000 | 20,000
Unrealized Gains (Losses) Recognized in AOCI |  | 959 | (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 |  | 1,379 | (30)
USD Canadian Exchange Future |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notional amount |  | 25,000 | 0
Unrealized Gains (Losses) Recognized in AOCI |  | (41) | $ 0
Cross-Currency Swaps |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Net investment hedge, gain (loss), after reclassification, tax | $ (2,156) | $ (621) |

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