The sink rate applied to cash flow projections for a cash-generating unit (group of units).

No definition available.

Name:	grfs_DescriptionOfSinkRateUsedToExtrapolateCashFlowProjections
Namespace Prefix:	grfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The success rate applied to cash flow projections for a cash-generating unit (group of units).

+ References

No definition available.

+ Details

Name:	grfs_DescriptionOfSuccessRateUsedToExtrapolateCashFlowProjections
Namespace Prefix:	grfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The term of the Government bonds used for risk-free interest rate applied to cash flow projections for a cash-generating unit (group of units).

+ References

No definition available.

+ Details

Name:	grfs_GovernmentBondsTermAppliedToCashFlowProjections
Namespace Prefix:	grfs_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of average estimated sales in future period as a percentage of initial sales estimates.

+ References

No definition available.

+ Details

Name:	grfs_PercentageOfAverageEstimatedSales
Namespace Prefix:	grfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of lower sales projection than initially projected has been estimated on average each year.

+ References

No definition available.

+ Details

Name:	grfs_PercentageOfLowerSalesProjectionEstimationOnAverageEachYear
Namespace Prefix:	grfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentual impairment of assets due to reasonably possible change in actuarial assumption.

+ References

No definition available.

+ Details

Name:	grfs_PercentualImpairmentOfAssetsDueToReasonablyPossibleChangeInActuarialAssumption
Namespace Prefix:	grfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of reasonably possible increase (decrease) in discount rate considered for calculation of recoverable amount of the cash generating unit (CGU).

+ References

No definition available.

+ Details

Name:	grfs_ReasonablyPossibleIncreaseDecreaseInDiscountRateConsideredForCalculationOfCashGeneratingUnitsRecoverableAmount
Namespace Prefix:	grfs_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The discount rate applied to cash flow projections for a cash-generating unit (group of units). [Refer: Total for all cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 134
-Subparagraph d
-Clause v
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_d_v&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 134
-Subparagraph e
-Clause v
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_e_v&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_d_iii&doctype=Standard
-URIDate 2025-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph f
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_f_ii&doctype=Standard
-URIDate 2025-03-27

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_d_iii&doctype=Standard
-URIDate 2025-03-27

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph f
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_f_ii&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_DescriptionOfDiscountRatesAppliedToCashFlowProjections
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The growth rate used to extrapolate cash flow projections beyond the period covered by the most recent budgets/forecasts for a cash-generating unit (group of units). [Refer: Total for all cash-generating units [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 134
-Subparagraph d
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_d_iv&doctype=Standard
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 36
-IssueDate 2025-01-01
-Paragraph 134
-Subparagraph e
-Clause iv
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=36&code=ifrs-tx-2025-en-r&anchor=para_134_e_iv&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph f
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_f_i&doctype=Standard
-URIDate 2025-03-27

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph d
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_d_ii&doctype=Standard
-URIDate 2025-03-27

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph d
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_d_ii&doctype=Standard
-URIDate 2025-03-27

Reference 6: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 254
-Subparagraph f
-Clause i
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_254_f_i&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_DescriptionOfGrowthRateUsedToExtrapolateCashFlowProjections
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with 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

- References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2025-01-01
-Paragraph B67
-Subparagraph d
-Clause v
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B67_d_v&doctype=Appendix&subtype=B
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 37
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_37_c&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 37
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_37_c&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_ImpairmentLossRecognisedInProfitOrLossGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

The percentage of voting equity interests acquired in a business combination. [Refer: Total for all business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2025-01-01
-Paragraph B64
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=3&code=ifrs-tx-2025-en-r&anchor=para_B64_c&doctype=Appendix&subtype=B
-URIDate 2025-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 35
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_35_c&doctype=Standard
-URIDate 2025-03-27

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2027-01-01
-Name IFRS
-Number 19
-IssueDate 2025-01-01
-Paragraph 35
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_35_c&doctype=Standard
-URIDate 2025-03-27

+ Details

Name:	ifrs-full_PercentageOfVotingEquityInterestsAcquired
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_BusinessCombinationsAxis=grfs_AccessBiologicalLLCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=grfs_AggregateSensitivityScenarioToMdsBtsAndCdxSalesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=grfs_BiopharmaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	srt_StatementScenarioAxis=grfs_ClinicalDiagnosticsSalesSensitivityScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=grfs_MolecularDonorScreeingMdsSalesSensitivityScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=grfs_BloodTypingSolutionBtsSalesSensitivityScenarioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=grfs_BioSuppliesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=grfs_KiroGrifolsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=ifrs-full_DiscountRateMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_UnobservableInputsAxis=grfs_PerpetualGrowthRateMeasurementInputMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=grfs_GigaGenIncorporationMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis=grfs_AlkahestIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Goodwill - Impairment testing (Details) - EUR (€) € in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2022
Goodwill
Term of the government bonds	20 years
Impairment loss recognised in profit or loss, goodwill	€ 10,000	€ 9,000
Access Biologicals, LLC
Goodwill
Ownership interest acquired (as a percent)			51.00%
Aggregate sensitivity scenario to MDS, BTS and CDx sales
Goodwill
% Asset Value	(11.00%)	(10.00%)
Biopharma
Goodwill
Perpetual growth rate	2.00%	2.10%
Pre-tax discount rate	11.20%	11.40%
Reasonably possible change in perpetual growth rate (as a percent)	0.50%	0.50%
Diagnostic
Goodwill
Perpetual growth rate	2.00%	2.00%
Pre-tax discount rate	11.20%	10.60%
Reasonably possible change in perpetual growth rate (as a percent)	0.50%	0.50%
Diagnostic \| Clinical diagnostics sales sensitivity scenario
Goodwill
Initially estimated sales	80.00%	80.00%
Diagnostic \| MDS
Goodwill
Percentage of lower sales projection estimation on average each year	10.00%	11.00%
Diagnostic \| BTS
Goodwill
Percentage of lower sales projection estimation on average each year	14.00%	15.00%
Bio Supplies
Goodwill
Perpetual growth rate	1.90%	1.90%
Pre-tax discount rate	10.30%	10.60%
Reasonably possible change in perpetual growth rate (as a percent)	0.50%	0.50%
Kiro Grifols
Goodwill
Perpetual growth rate	1.60%	1.60%
Pre-tax discount rate	11.80%	11.60%
Reasonably possible change in perpetual growth rate (as a percent)	0.50%	0.50%
Kiro Grifols \| Discount rate
Goodwill
% Asset Value	(4.00%)	(5.00%)
Discount rate sensitivity	0.50%	0.50%
Kiro Grifols \| Perpetual growth rate
Goodwill
% Asset Value	(2.00%)	(4.00%)
Discount rate sensitivity		(0.50%)
Reasonably possible change in perpetual growth rate (as a percent)	(0.50%)
GigaGen Inc..
Goodwill
Pre-tax discount rate	17.90%	17.90%
Sink rate		5.00%
Success rate	20.00%	20.00%
GigaGen Inc.. \| Discount rate
Goodwill
% Asset Value	(13.00%)	(7.00%)
Discount rate sensitivity	2.00%	2.00%
Alkahest Inc
Goodwill
Success rate	12.00%
Impairment loss recognised in profit or loss, goodwill	€ 10
Alkahest Inc \| Minimum
Goodwill
Pre-tax discount rate	25.90%	25.90%
Success rate		12.00%
Alkahest Inc \| Maximum
Goodwill
Pre-tax discount rate	39.80%	39.80%
Success rate		17.00%
Alkahest Inc \| Discount rate
Goodwill
% Asset Value	(11.00%)	(17.00%)
Discount rate sensitivity	2.00%	2.00%