v3.25.1

Non-current and current financial investments - Non-current financial investments (Details) - EUR (€)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Disclosure of detailed information about financial instruments [line items]
Total non-current financial investments	€ 200,182,000
Maturity		3 months
Term Deposits [member]
Disclosure of detailed information about financial instruments [line items]
Total non-current financial investments	€ 200,182,000
Maturity	18 months

X

- Definition

Refers to the maturity period for term deposit

+ References

No definition available.

+ Details

Name:	glpg_MaturityPeriodForTermDeposit
Namespace Prefix:	glpg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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

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

X

- Definition

The amount of non-current financial assets that the entity does not separately disclose in the same statement or note. [Refer: Other financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 54
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_54_d&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_OtherNoncurrentFinancialAssets
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	ifrs-full_ClassesOfFinancialInstrumentsAxis=glpg_TermDepositsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: