v3.26.1
Document and Entity Information - shares
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2023
Statement    
Document Type 20-F  
Document Registration Statement false  
Document Annual Report true  
Document Period End Date Dec. 31, 2025  
Document Transition Report false  
Document Shell Company Report false  
Entity Registrant Name Grifols SA  
Securities Act File Number 001-35193  
Entity Incorporation, State or Country Code U3  
Entity Address, Address Line One Avinguda de la Generalitat, 152-158  
Entity Address, Address Line Two Parc de Negocis Can Sant Joan  
Entity Address, Address Line Three Sant Cugat del Vallès  
Entity Address, City or Town Barcelona  
Entity Address, Country ES  
Entity Address, Postal Zip Code 08174  
Title of 12(b) Security American Depositary Shares  
Trading Symbol GRFS  
Security Exchange Name NASDAQ  
Entity Well-known Seasoned Issuer Yes  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Emerging Growth Company false  
Document Accounting Standard International Financial Reporting Standards  
Entity Shell Company false  
Entity Central Index Key 0001438569  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus FY  
Amendment Flag false  
ICFR Auditor Attestation Flag true  
Document Financial Statement Error Correction [Flag] false  
Auditor Name Deloitte Auditores, S.L. KPMG Auditores, S.L.
Auditor Firm ID 1223 1027
Auditor Location Barcelona, Spain Barcelona, Spain
Business Contact    
Statement    
Contact Personnel Name David Ian Bell  
Contact Personnel Email Address david.bell@grifols.com  
Entity Address, Address Line One Grifols Shared Services North America, Inc.  
Entity Address, Address Line Two 2410 Grifols Way  
Entity Address, City or Town Los Angeles  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 90032  
Country Region 34  
City Area Code 93  
Local Phone Number 571 02 21  
Class A, Ordinary shares    
Statement    
Entity Common Stock, Shares Outstanding 426,129,798  
Class B, Preference shares    
Statement    
Entity Common Stock, Shares Outstanding 261,425,110