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Commitments and Contingencies - Schedule of Aggregate Commitments (Details) - EUR (€) € in Thousands	Dec. 31, 2024	Sep. 30, 2024
Disclosure of contingent liabilities [abstract]
Purchase commitments	€ 26,930	€ 25,778
Lease payments	10,187	13,598
Total	€ 37,117	€ 39,376

X

- Definition

Aggregate commitments.

+ References

No definition available.

+ Details

Name:	birk_AggregateCommitments
Namespace Prefix:	birk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Lease payments.

+ References

No definition available.

+ Details

Name:	birk_LeasePayments
Namespace Prefix:	birk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Purchase commitments.

+ References

No definition available.

+ Details

Name:	birk_PurchaseCommitments
Namespace Prefix:	birk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfContingentLiabilitiesAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration