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Commitments And Contingencies - Additional Information (Details) € in Millions	3 Months Ended
	Dec. 31, 2024 EUR (€)
Disclosure of contingent liabilities [abstract]
Initial planintiff claim amount	€ 94.7
Plaintiff claim amount	€ 41.6

X

- Definition

Initial plaintiff claim amount.

+ References

No definition available.

+ Details

Name:	birk_InitialPlaintiffClaimAmount
Namespace Prefix:	birk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Plaintiff Claim Amount

+ References

No definition available.

+ Details

Name:	birk_PlaintiffClaimAmount
Namespace Prefix:	birk_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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