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Equity - Reserves - Drawdown of Accumulated Gains (Details) - EUR (€) € in Thousands	Dec. 31, 2019	Dec. 31, 2018
Equity
Restricted reserves	€ 12,891	€ 35,613

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- Definition

Reserves, restricted reserves, development costs, carrying value, pending amortization, in accordance with applicable legislation.

+ References

No definition available.

+ Details

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Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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