v3.25.1

Share based payments - Restricted stock units - Category (Details) - EquityInstruments | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Share based payments |  |  |  |  |
Total outstanding | 11,911,109 | 11,472,520 | 10,816,856 | 8,579,837 |
Restricted Stock Units (RSUs) |  |  |  |  |
Share based payments |  |  |  |  |
Total outstanding | 1,306,271 | 1,175,453 | 736,095 |  | 657,803
Restricted Stock Units (RSUs) | Members of the Executive Committee |  |  |  |  |
Share based payments |  |  |  |  |
Total outstanding | 564,034 | 438,738 | 332,038 |  |
Restricted Stock Units (RSUs) | Personnel |  |  |  |  |
Share based payments |  |  |  |  |
Total outstanding | 742,237 | 736,715 | 404,057 |  |

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_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=glpg_IfrsRestrictedStockUnitsRsusMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=glpg_ManagementBoardMembersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfRelatedPartiesAxis=glpg_PersonnelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |