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Equity - Restricted Share Unit Retention Plan (Details) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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