v3.25.1

Off-balance sheet arrangements narrative (Details) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | May 30, 2024 USD ($) | Dec. 31, 2023 EUR (€)
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Disclosure of analysis of single amount of off-balance sheet arrangements [line items] |  |  |  |
Purchase Commitments Related To Projects In Development Phase | € 160,900,000 |  |  | € 239,600,000
Purchase Commitment Related to Shared Services | 46,000,000 |  |  | 45,900,000
Purchase Commitment Related to Jyseleca Product Supply Chain | 2,600,000 |  |  | 14,200,000
Purchase Commitment Related to Commercial And Medical Affairs | 1,700,000 |  |  | 29,900,000
Purchase Commitment Related To Project In Discovery Research Phase | 60,900,000 |  |  | 79,000,000
Purchase Commitment Related To Services From Novalix. | 41,600,000 |  |  |
Purchase commitments | 272,240,000 |  |  | € 408,521,000
Commitments With Adaptimmune. | $ |  | $ 465,000,000 |  |
Commitments With Another Pharmaceutical Company | € 243,500,000 |  |  |
Adaptimmune Collaboration [member] |  |  |  |
Disclosure of analysis of single amount of off-balance sheet arrangements [line items] |  |  |  |
Purchase commitment related to R&D funding | $ |  |  | $ 15,000,000 |
Purchase Commitment Related To Option Exercise Fees | $ |  |  | $ 100,000,000 |

X
- Definition Commitment with adaptimmune for potential milestones. + References No definition available. + Details
Name: | glpg_CommitmentsWithAdaptimmune.
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitment with another pharmaceutical company on an undiscounted and non-risk adjusted basis to support the company's cell therapy programs in oncology. + References No definition available. + Details
Name: | glpg_CommitmentsWithAnotherPharmaceuticalCompany
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase commitments related to Commercial And Medical Affairs + References No definition available. + Details
Name: | glpg_PurchaseCommitmentRelatedToCommercialAndMedicalAffairs
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase commitments related to Jyseleca Product Supply Chain + References No definition available. + Details
Name: | glpg_PurchaseCommitmentRelatedToJyselecaProductSupplyChain
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase commitments related to option exercise fees. + References No definition available. + Details
Name: | glpg_PurchaseCommitmentRelatedToOptionExerciseFees
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase commitments related to Project In Discovery Research Phase + References No definition available. + Details
Name: | glpg_PurchaseCommitmentRelatedToProjectInDiscoveryResearchPhase
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase commitments related to research and development funding. + References No definition available. + Details
Name: | glpg_PurchaseCommitmentRelatedToResearchAndDevelopmentFunding
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase commitments related to Services From Novalix. + References No definition available. + Details
Name: | glpg_PurchaseCommitmentRelatedToServicesFromNovalix.
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase commitments related to shared services + References No definition available. + Details
Name: | glpg_PurchaseCommitmentRelatedToSharedServices
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase commitments + References No definition available. + Details
Name: | glpg_PurchaseCommitments
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase commitments Related To Projects In Development Phase. + References No definition available. + Details
Name: | glpg_PurchaseCommitmentsRelatedToProjectsInDevelopmentPhase
Namespace Prefix: | glpg_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | ifrs-full_CounterpartiesAxis=glpg_AdaptimmuneCollaborationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |