v3.25.3
Foreign Exchange Gain (Loss) - Additional Information (Details) - EUR (€)
€ in Millions
12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Foreign exchange gain (loss) [abstract]
Unrealized foreign exchange gain
€ 10.8
€ 8.9
X
- Definition
Unrealized foreign exchange gain.
+ References
No definition available.
+ Details
Name:
birk_UnrealizedForeignExchangeGain
Namespace Prefix:
birk_
Data Type:
xbrli:monetaryItemType
Balance Type:
credit
Period Type:
duration
X
- References
No definition available.
+ Details
Name:
ifrs-full_ForeignExchangeGainLossAbstract
Namespace Prefix:
ifrs-full_
Data Type:
xbrli:stringItemType
Balance Type:
na
Period Type:
duration