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Financial Instruments and Financial Risk Management - Additional Information (Details) - EUR (€)	3 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure of fair value measurement [abstract]
Transfers out of level 1 into level 2 of fair value hierarchy, liabilities held at end of reporting period	€ 0	€ 0
Decrease in fair value recorded through Finance cost, net	€ 3,200,000
Percentge of increase decrease in yield volatility	2.50%
Percentage of yield volatility	40.00%
Increase/decrease in fair value	€ 1,300,000
Percentage of credit spread	1.07%

X

- Definition

Decrease in fair value recorded through Finance cost, net.

+ References

No definition available.

+ Details

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

X

- Definition

Disclosure of fair value measurement.

+ References

No definition available.

+ Details

Name:	birk_DisclosureOfFairValueMeasurementAbstract
Namespace Prefix:	birk_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

increase/decrease in fair value.

+ References

No definition available.

+ Details

Name:	birk_IncreaseDecreaseInFairValue
Namespace Prefix:	birk_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Percentage of credit spread.

+ References

No definition available.

+ Details

Name:	birk_PercentageOfCreditSpread
Namespace Prefix:	birk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of increase/decrease in yield volatility.

+ References

No definition available.

+ Details

Name:	birk_PercentageOfIncreaseDecreaseInYieldVolatility
Namespace Prefix:	birk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of yield volatility.

+ References

No definition available.

+ Details

Name:	birk_PercentageOfYieldVolatility
Namespace Prefix:	birk_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of transfers out of Level 1 and into Level 2 of the fair value hierarchy of liabilities held at the end of the reporting period. [Refer: Level 1 of fair value hierarchy [member]; Level 2 of fair value hierarchy [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 13
-IssueDate 2024-01-01
-Paragraph 93
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=13&code=ifrs-tx-2024-en-r&anchor=para_93_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_TransfersOutOfLevel1IntoLevel2OfFairValueHierarchyLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration