Quarterly report [Sections 13 or 15(d)]

Derivatives and Hedging Activities - Interest Rate Swap Contracts Reflected in Consolidated Balance Sheets (Details)

v3.26.1
Derivatives and Hedging Activities - Interest Rate Swap Contracts Reflected in Consolidated Balance Sheets (Details) - USD ($)
$ in Thousands
Jun. 30, 2026
Sep. 30, 2025
Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total derivatives $ 837 $ (2,338)
Cross-Currency Swaps    
Derivatives, Fair Value [Line Items]    
Advance payments received from counterparties   40,186
Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Total derivatives (32,329) (58,541)
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent | Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Assets derivatives 609 15
Balance Sheet Location [Axis]: us-gaap:OtherAssetsCurrent | Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Assets derivatives 0 0
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Assets derivatives 528 24
Balance Sheet Location [Axis]: us-gaap:OtherAssetsNoncurrent | Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Assets derivatives 0 0
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent | Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Liability derivatives (230) (973)
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesCurrent | Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Liability derivatives (22,608) (45,914)
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent | Interest Rate Swaps | Cash flow hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Liability derivatives (70) (1,404)
Balance Sheet Location [Axis]: us-gaap:OtherLiabilitiesNoncurrent | Cross-Currency Swaps | Net investment hedges | Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Liability derivatives $ (9,721) $ (12,627)