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Segment Information - Additional Information (Details) - Segment	3 Months Ended	12 Months Ended
	Dec. 31, 2024	Sep. 30, 2024
Disclosure of operating segments [abstract]
Number of operating segment		4
Number of reportable segment	3	3

X

- Definition

Number of operating segment.

+ References

No definition available.

+ Details

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Namespace Prefix:	birk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of reportable segment.

+ References

No definition available.

+ Details

Name:	birk_NumberOfReportableSegment
Namespace Prefix:	birk_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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