The amount of decrease in lease liability by discounting using the group's incremental borrowing rate.

No definition available.

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Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of decrease in lease liabilities by other changes after adoption of IFRS 16.

+ References

No definition available.

+ Details

Name:	grfs_DecreaseInLeaseLiabilitiesByOtherChangesAfterAdoptionOfIfrs16
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of decrease in lease liabilities by recognition of short-term leases as expense after adoption of IFRS 16.

+ References

No definition available.

+ Details

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Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of liabilities related to finance leases.

+ References

No definition available.

+ Details

Name:	grfs_FinanceLeaseLiabilities
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of increase in lease liability for periods covered by an option to extend the lease by the group after adoption of IFRS 16.

+ References

No definition available.

+ Details

Name:	grfs_IncreaseInLeaseLiabilityPeriodsCoveredByOptionToExtendLeaseAfterAdoptionOfIfrs16
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

+ References

No definition available.

+ Details

Name:	grfs_MinimumLeasePaymentsPayableUnderNonCancellableOperatingLease
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- 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_DisclosureOfQuantitativeInformationAboutRightofuseAssetsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2019-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_LeaseLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_NewIFRSsAxis=grfs_AdoptionOfIfrs16Member
Namespace Prefix:
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Period Type:

Basis of Presentation - Reconciliation of lease liabilities (Details) - EUR (€) € in Thousands	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Dec. 31, 2017
Leases
Operating lease commitments existing as at 31 December 2018			€ 400,579	€ 262,343
Lease liability recognised	€ 740,690
Adoption of IFRS 16
Leases
Operating lease commitments existing as at 31 December 2018		€ 400,579
Periods covered by an option to extend the lease by the Group		579,261
Discounting using the Group's incremental borrowing rate		(311,116)
Finance lease liabilities recognised as at 31 December 2018		1,395
Short-term leases recognised on a straight-line basis as expense		(4,822)
Others		(349)
Lease liability recognised		€ 664,948