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Equity - Reserves - Drawdown of Accumulated Gains (Details) - EUR (€) € in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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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