v3.25.1

Operating costs and other operating income - Summary of research and development expenditure (Details) - EUR (€) € in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Total R&D expenses | € (335,459) | € (241,294) | € (269,797)
Personnel costs [member] |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Total R&D expenses | (87,740) | (95,788) | (115,484)
Subcontracting [member] |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Total R&D expenses | (160,076) | (82,997) | (61,192)
Disposables and lab fees and premise costs [member] |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Total R&D expenses | (17,629) | (18,083) | (19,529)
Depreciation And Impairment [member] |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Total R&D expenses | (35,378) | (22,254) | (51,493)
Professional fees [member] |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Total R&D expenses | (15,949) | (9,272) | (9,316)
Other operating expenses [member] |  |  |
Disclosure of attribution of expenses by nature to their function [line items] |  |  |
Total R&D expenses | € (18,687) | € (12,900) | € (12,783)

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

X
- Definition The amount of expenditure directly attributable to research or development activities, recognised in profit or loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2024-01-01 -Paragraph 126 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2024-en-r&anchor=para_126&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ResearchAndDevelopmentExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis=glpg_PersonnelCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis=glpg_SubcontractingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis=glpg_DisposablesAndLabFeesAndPremiseCostsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis=glpg_DepreciationAndImpairmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis=glpg_ProfessionalFeesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_AttributionOfExpensesByNatureToTheirFunctionAxis=glpg_OtherOperatingExpensesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |