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Significant Accounting Policies - Financial instruments (Details) € in Thousands	Dec. 31, 2019 EUR (€)
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