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v3.20.1

Goodwill - Schedule of reasonable possible changes (Details) | 12 Months Ended
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Dec. 31, 2019
Bioscience |
Disclosure of information for cash-generating units [line items] |
Reasonably possible change in perpetual growth rate (as a percent) | 0.50%
Reasonably possible change in pre-tax discount rate (as a percent) | 0.50%
Diagnostic |
Disclosure of information for cash-generating units [line items] |
Reasonably possible change in EBITDA margin multiple (as a percent) | 2.50%
Hospital |
Disclosure of information for cash-generating units [line items] |
Reasonably possible change in perpetual growth rate (as a percent) | 0.50%
Reasonably possible change in pre-tax discount rate (as a percent) | 0.50%

X
- Definition The percentage of reasonably possible increase (decrease) in EBITDA margin multiple considered for calculation of recoverable amount of the cash generating unit (CGU). + References No definition available. + Details
Name: | grfs_ReasonablyPossibleIncreaseDecreaseInEbitdaMarginMultipleConsideredForCalculationOfCashGeneratingUnitSRecoverableAmount
Namespace Prefix: | grfs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of reasonably possible increase (decrease) in perpetual growth rate considered for calculation of recoverable amount of the cash generating unit (CGU). + References No definition available. + Details
Name: | grfs_ReasonablyPossibleIncreaseDecreaseInPerpetualGrowthRateConsideredForCalculationOfCashGeneratingUnitSRecoverableAmount
Namespace Prefix: | grfs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of reasonably possible increase (decrease) in pre-tax discount rate considered for calculation of recoverable amount of the cash generating unit (CGU). + References No definition available. + Details
Name: | grfs_ReasonablyPossibleIncreaseDecreaseInPreTaxDiscountRateConsideredForCalculationOfCashGeneratingUnitSRecoverableAmount
Namespace Prefix: | grfs_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=grfs_DiagnosticMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=grfs_HospitalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |