v3.25.3
Accounting Policies - Schedule of Estimated Useful Lives of Intangible Assets (Details)
 12 Months Ended
Sep. 30, 2025
Brand Name "Birkenstock"  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives of intangible assets, description Indefinite
Customer Relationships | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives of intangible assets 8 years
Customer Relationships | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives of intangible assets 15 years
Purchased Licenses and Other Intangible Assets | Minimum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives of intangible assets 3 years
Purchased Licenses and Other Intangible Assets | Maximum  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives of intangible assets 5 years