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Derivatives and Hedging Activities - Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Sep. 30, 2025
Designated as Hedging Instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Unrealized gain expected to be recognized over the next 12 months | $ 392 |
Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Unrealized loss on fair value of interest rate swaps, before tax | 820 | $ 2,338
Unrealized loss on fair value of interest rate swaps, after tax | 621 | 1,752
LIBOR-Based Swap | Cash flow hedges | Designated as Hedging Instrument |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Unrecognized gain on LIBOR-based swaps | 1,011 | 1,605
Unrecognized gain on LIBOR-based swaps, after tax | 757 | 1,199
Cross-Currency Swaps |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |
Advance payments received from counterparties | $ 40,186 | $ 40,186

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- Definition Amount of after tax unrealized gain (loss) related to the increase or decrease in fair value of interest rate derivatives designated as cash flow hedging instruments, which was recorded in accumulated other comprehensive income to the extent that the cash flow hedge was determined to be effective. + References No definition available. + Details
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