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Derivatives and Hedging Activities - Interest Rate Swap Contracts Reflected in Consolidated Balance Sheets (Details) - Designated as Hedging Instrument - USD ($) $ in Thousands | Mar. 31, 2024 | Sep. 30, 2023
--- | --- | ---
Interest Rate Swaps | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives | $ 1,767 | $ 4,006
Cross- Currency Swaps | Net investment hedges |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives | (5,076) | (2,766)
Other current assets | Interest Rate Swaps | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Assets derivatives | 472 | 920
Other current assets | Cross- Currency Swaps | Net investment hedges |  |
Derivatives, Fair Value [Line Items] |  |
Assets derivatives | 0 | 0
Other assets | Interest Rate Swaps | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Assets derivatives | 1,417 | 3,086
Other assets | Cross- Currency Swaps | Net investment hedges |  |
Derivatives, Fair Value [Line Items] |  |
Assets derivatives | 0 | 0
Other current liabilities | Interest Rate Swaps | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (31) | 0
Other current liabilities | Cross- Currency Swaps | Net investment hedges |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | 0 | 0
Other liabilities | Interest Rate Swaps | Cash flow hedges |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (91) | 0
Other liabilities | Cross- Currency Swaps | Net investment hedges |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | $ (5,076) | $ (2,766)

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