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Financial Instruments and Financial Risk Management - Schedule of Fair Value and Fair Value Hierarchy of Tax Receivable Liability Carried at Amortized Cost (Details) - EUR (€) € in Thousands	Dec. 31, 2024	Sep. 30, 2024
Disclosure of fair value measurement of liabilities [line items]
Tax receivable agreement liability	€ 360,620	€ 344,590
Carrying Value | Level 3
Disclosure of fair value measurement of liabilities [line items]
Tax receivable agreement liability	377,331	359,890
Fair Value | Level 3
Disclosure of fair value measurement of liabilities [line items]
Tax receivable agreement liability	€ 383,207	€ 382,619

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- Definition

Tax receivable agreement liability.

+ References

No definition available.

+ Details

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Namespace Prefix:	birk_
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Balance Type:	credit
Period Type:	instant

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

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- Details

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X

- Details

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Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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