v3.25.3
Intangible Assets - Summary of Intangible Assets (Details) - EUR (€)
€ in Thousands
 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disclosure of detailed information about intangible assets [line items]    
Beginning balance € 1,639,393  
Ending balance 1,577,248 € 1,639,393
Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,733,812 1,775,215
Additions 6,235 10,882
Disposals (23) (942)
Transfers 275  
Impact of foreign currency translation (44,424) (51,343)
Ending balance 1,695,875 1,733,812
Accumulated Amortization    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (94,419) (69,479)
Amortization (28,666) (28,239)
Disposals 15 938
Impact of foreign currency translation 4,443 2,361
Ending balance (118,627) (94,419)
Brands and Trademarks    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,405,815  
Ending balance 1,374,473 1,405,815
Brands and Trademarks | Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,405,815 1,444,184
Impact of foreign currency translation (31,342) (38,369)
Ending balance 1,374,473 1,405,815
Customer Relationships    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 220,607  
Ending balance 186,291 220,607
Customer Relationships | Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 309,921 323,259
Impact of foreign currency translation (12,487) (13,338)
Ending balance 297,434 309,921
Customer Relationships | Accumulated Amortization    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (89,314) (65,472)
Amortization (26,291) (26,662)
Impact of foreign currency translation 4,462 2,820
Ending balance (111,143) (89,314)
Intangible Assets under Development and Prepayments    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 11,112  
Ending balance 2,987 11,112
Intangible Assets under Development and Prepayments | Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 11,112 1,052
Additions 2,288 10,457
Disposals (8) (4)
Transfers (10,255) (300)
Impact of foreign currency translation (150) (93)
Ending balance 2,987 11,112
Other Intangible Assets    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 1,859  
Ending balance 13,497 1,859
Other Intangible Assets | Cost    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance 6,964 6,720
Additions 3,947 425
Disposals (15) (938)
Transfers 10,530 300
Impact of foreign currency translation (445) 457
Ending balance 20,981 6,964
Other Intangible Assets | Accumulated Amortization    
Disclosure of detailed information about intangible assets [line items]    
Beginning balance (5,105) (4,007)
Amortization (2,375) (1,577)
Disposals 15 938
Impact of foreign currency translation (19) (459)
Ending balance € (7,484) € (5,105)