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Equity - Distribution of Profit - Approved Distribution of Profit (Details) € in Thousands	12 Months Ended
	Dec. 31, 2018 EUR (€)
Equity
Voluntary reserve	€ 91,059
Dividends	238,659
Profit of the Parent	€ 329,718

X

- Definition

Approved distribution of profit, dividends.

+ References

No definition available.

+ Details

Name:	grfs_ApprovedDistributionOfProfitDividends
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Approved distribution of profit, profit of the parent.

+ References

No definition available.

+ Details

Name:	grfs_ApprovedDistributionOfProfitProfitOfParent
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Approved distribution of profit, voluntary reserve.

+ References

No definition available.

+ Details

Name:	grfs_ApprovedDistributionOfProfitVoluntaryReserve
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfClassesOfShareCapitalAbstract
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration