v3.25.3
Financial Risk Management Objectives and Policies - Additional Information (Details)
€ in Millions, $ in Millions
12 Months Ended
Sep. 30, 2025
EUR (€)
Customer
Sep. 30, 2024
EUR (€)
Customer
Sep. 30, 2025
USD ($)
Customer
Disclosure of detailed information about financial instruments [line items]      
Number of customer | Customer 1 1 1
Percentage of concentration of receivables 10.00% 10.00% 10.00%
Weakening of Euro against major currency 10.00%    
Reclassified the cash flow hedge reserve of a cumulative loss € 0.3    
Negative effect on net profit (loss) € 5.4 € 7.1  
Accounts Receivables      
Disclosure of detailed information about financial instruments [line items]      
Percentage of concentration of receivables 14.00% 13.00% 14.00%
Interest Rate Risk | Euro Denominated Facility      
Disclosure of detailed information about financial instruments [line items]      
Notional amount € 375.0    
Interest Rate Risk | USD Denominated Facility      
Disclosure of detailed information about financial instruments [line items]      
Notional amount | $     $ 850.0
Interest Rate Risk | New Euro Denominated Facility      
Disclosure of detailed information about financial instruments [line items]      
Borrowings € 375.0    
Interest Rate Risk | New USD Denominated Facility      
Disclosure of detailed information about financial instruments [line items]      
Borrowings | $     $ 280.0
Interest Rate Risk | Senior Term Facilities Agreement      
Disclosure of detailed information about financial instruments [line items]      
Maturity date April 30, 2028, but was extinguished and replaced by the term loans under the new Term and Revolving Facilities Agreement (as defined below) effective August 2, 2024