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Equity - Restricted Share Unit Retention Plan (Details) - EUR (€) € in Thousands	Dec. 31, 2019	Dec. 31, 2018
Equity
Cumulative accrual amount	€ 12,498	€ 12,652

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- Definition

Restricted share unit compensation, commitment settled in equity instruments, cumulative accrual.

+ References

No definition available.

+ Details

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Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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