Current tax expense income under the fully vested program.

No definition available.

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- Definition

Minimum required period for exit event to occur after the grant.

+ References

No definition available.

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- Definition

Number of tranches.

+ References

No definition available.

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- Definition

Percentage of share-based compensation arrangement by share-based payment award, options, grants in period, gross.

+ References

No definition available.

+ Details

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- Definition

Percentage of shares granted included in grant date fair value accounted after occurrence of exit event.

+ References

No definition available.

+ Details

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- Definition

Percentage of shares granted that vests with occurrence of an exit.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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- Definition

Percentage of shares granted vesting after each year of service.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:percentItemType
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- Definition

Receivable partially paid back amount.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Share-based compensation arrangement by share-based payment award, award granted vesting period.

+ References

No definition available.

+ Details

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

- References

No definition available.

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Data Type:	xbrli:stringItemType
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Period Type:	duration

- References

No definition available.

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Data Type:	xbrli:decimalItemType
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- References

No definition available.

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- Details

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- Details

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Share-based Compensation - Additional Information (Details) € / shares in Units, € in Millions, $ in Millions	1 Months Ended
	Jul. 31, 2024 EUR (€)	Jul. 31, 2024 USD ($)	Dec. 31, 2023 EUR (€)	Dec. 31, 2023 USD ($)	Mar. 31, 2023 shares Tranche € / shares
Events After Reporting Period
Disclosure of terms and conditions of share-based payment arrangement [line items]
Receivable partially paid back amount	€ 7.1	$ 7.6
Management Investment Plan
Disclosure of terms and conditions of share-based payment arrangement [line items]
Personal income taxes paid for the fully vested program			€ 11.4	$ 12.6
Management Investment Plan \| BK LC Manco GmbH & Co. KG
Disclosure of terms and conditions of share-based payment arrangement [line items]
Number of shares granted \| shares					1,197,100
Number of tranches \| Tranche					5
Percentage of shares granted to each tranche					20.00%
Granted shares vesting period					4 years
Percentage of shares granted vesting after each year of service					20.00%
Percentage of shares granted that vests with occurrence of an exit					20.00%
Minimum required period for exit event to occur after the grant					12 months
Weighted average fair value of the awards granted \| € / shares					€ 57.57
Management Investment Plan \| BK LC Manco GmbH & Co. KG \| First Tranche
Disclosure of terms and conditions of share-based payment arrangement [line items]
Percentage of grants included in grant date fair value, accounted after occurrence of exit event					20.00%