Allego N.V. Annual and transition report of foreign private issuers [Sections 13 or 15(d)]

Annual and transition report of foreign private issuers [Sections 13 or 15(d)]

Cover
- Cover
- Audit Information
Financial Statements
Notes to Financial Statements
Accounting Policies
- Material accounting policies (Policies)
Notes Tables
Notes Details

Borrowings - Summary of Breakdown of Borrowings (Detail)

v3.25.1

Borrowings - Summary of Breakdown of Borrowings (Detail) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2025	Dec. 27, 2024	Dec. 20, 2024	Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]
Borrowings	€ 512,014				€ 350,722
Euribor floored rate	0.00%
Renewed facility
Disclosure of detailed information about borrowings [line items]
Borrowings	€ 364,577				350,722
Interest rate	3.90%
Renewed facility \| Forecast \| Top of range
Disclosure of detailed information about borrowings [line items]
Borrowings, adjustment to interest rate basis		0.20%
Renewed facility \| Borrowings
Disclosure of detailed information about borrowings [line items]
Interest rate	3.90%
Convertible instruments
Disclosure of detailed information about borrowings [line items]
Borrowings	€ 147,437		€ 150,000		€ 0
Interest rate			15.00%	15.00%
Convertible instruments \| Borrowings
Disclosure of detailed information about borrowings [line items]
Interest rate	15.00%

- Definition

Euribor Floored Rate.

+ References

No definition available.

+ Details

Name:	allg_EuriborFlooredRate
Namespace Prefix:	allg_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of outstanding funds that the entity is obligated to repay.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_Borrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 7
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_7&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_BorrowingsAdjustmentToInterestRateBasis
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The interest rate on borrowings. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_BorrowingsInterestRate
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- 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

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

- Details

Name:	ifrs-full_BorrowingsByNameAxis=allg_TheRenewedFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=ifrs-full_LongtermBorrowingsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_BorrowingsByNameAxis=ifrs-full_ConvertibleInstrumentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: