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Derivatives and Hedging Activities - Interest Rate Swap Contracts Reflected in Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Sep. 30, 2024
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Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives | $ (2,209) | $ (2,606)
Cross-Currency Swaps |  |
Derivatives, Fair Value [Line Items] |  |
Advance payments received from counterparties | 40,186 | 58,432
Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Total derivatives | (59,717) | (66,967)
Other current assets | Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Assets derivatives | 42 | 0
Other current assets | Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Assets derivatives | 0 | 0
Other non-current assets | Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Assets derivatives | 73 | 0
Other non-current assets | Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Assets derivatives | 0 | 0
Other current liabilities | Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (870) | (863)
Other current liabilities | Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (21,006) | (18,042)
Other non-current liabilities | Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | (1,454) | (1,743)
Other non-current liabilities | Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument |  |
Derivatives, Fair Value [Line Items] |  |
Liability derivatives | $ (38,711) | $ (48,925)

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