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Significant Accounting Policies - Financial instruments (Details) € in Thousands | Dec. 31, 2019 EUR (€)
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Significant Accounting Policies |
Interest rate used as a threshold to determine if there has been a substantial modification to the initially recognized financial liability | 10.00%
Provision for future operating losses | € 0

X
- Definition The interest rate used as a threshold to determine if there has been a substantial modification to the initially recognized financial liability. + References No definition available. + Details
Name: | grfs_FinancialLiabilityThresholdPercentageForRecognitionOfSubstantialModification
Namespace Prefix: | grfs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of provision for future operating losses. + References No definition available. + Details
Name: | grfs_ProvisionForOperatingLosses
Namespace Prefix: | grfs_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | grfs_SummaryOfSignificantAccountingPoliciesAbstract
Namespace Prefix: | grfs_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration