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

DERIVATIVES AND HEDGING ACTIVITIES - Narrative (Details)

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DERIVATIVES AND HEDGING ACTIVITIES - Narrative (Details)
€ in Thousands, $ in Thousands
12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2025
EUR (€)
Sep. 30, 2024
EUR (€)
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative settlement $ 37,092 $ 0 $ 0    
Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Unrealized gain expected to be recognized over the next 12 months 115        
Net Investment Hedging | Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, notional amount 126,392 146,392      
Interest Rate Swaps | Cash Flow Hedging | Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Unrealized loss on fair value of interest rate swaps, before tax 2,338 2,606      
Unrealized loss on fair value of interest rate swaps, after tax 1,752 1,948      
Derivative, notional amount 225,000 175,000      
LIBOR-Based Swap | Cash Flow Hedging | Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Unrecognized gain on derivative 1,605 3,848      
Unrecognized gain on derivative, after tax 1,199 2,874      
Cross-Currency Swaps          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Advance payments received from counterparties 40,186 58,432      
Cross-Currency Swaps | Net Investment Hedging          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative settlement 37,092        
Cross-Currency Swaps | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Unrealized losses, net of tax $ 4,652 2,156      
Cross-Currency Swaps | Net Investment Hedging | Designated as Hedging Instrument | Other current liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liability, current   17,416      
Cross-Currency Swaps | Net Investment Hedging | Designated as Hedging Instrument | Other non-current liabilities          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative liability, current   41,016      
Foreign Exchange Contract | Foreign Line of Credit          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Derivative, notional amount   33,485   € 0 € 30,000
Foreign Exchange Contract | Net Investment Hedging | Designated as Hedging Instrument          
Derivative Instruments and Hedging Activities Disclosures [Line Items]          
Currency losses, income tax   3,820      
Unrealized losses, net of tax   $ 1,113