Annual report [Section 13 and 15(d), not S-K Item 405]

DERIVATIVES AND HEDGING ACTIVITIES - Interest Rate Swap Contracts Reflected in Consolidated Balance Sheets (Details)

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DERIVATIVES AND HEDGING ACTIVITIES - Interest Rate Swap Contracts Reflected in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total derivatives $ (2,338) $ (2,606)
Cross-Currency Swaps    
Derivatives, Fair Value [Line Items]    
Advance payments received from counterparties 40,186 58,432
Cross-Currency Swaps | Net Investment Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total derivatives (58,541) (66,967)
Other current assets | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Assets derivatives 15 0
Other current assets | Cross-Currency Swaps | Net Investment Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Assets derivatives 0 0
Other non-current assets | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Assets derivatives 24 0
Other non-current assets | Cross-Currency Swaps | Net Investment Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Assets derivatives 0 0
Other current liabilities | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Liability derivatives (973) (863)
Other current liabilities | Cross-Currency Swaps | Net Investment Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Liability derivatives (45,914) (18,042)
Other non-current liabilities | Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Liability derivatives (1,404) (1,743)
Other non-current liabilities | Cross-Currency Swaps | Net Investment Hedging | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Liability derivatives $ (12,627) $ (48,925)