The rate of credit losses, calculated as percentage of the gross carrying amount.

No definition available.

Name:	grfs_CreditLossRate
Namespace Prefix:	grfs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The increase (decrease) in deferred expenses related to financial liabilities on the basis of their measurement categories in accordance with IAS 39 (ie not resulting from a change in the measurement attribute on transition to IFRS 9).

+ References

No definition available.

+ Details

Name:	grfs_IncreaseDecreaseInDeferredExpensesRelatedToFinancialLiabilitiesOnBasisOfMeasurementCategoryInitialApplicationOfIfrs9
Namespace Prefix:	grfs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_DisclosureOfFinancialInstrumentsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The increase (decrease) in financial liabilities on the basis of their measurement categories in accordance with IAS 39 (ie not resulting from a change in the measurement attribute on transition to IFRS 9). [Refer: Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 42L
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_42L_a&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_IncreaseDecreaseInFinancialLiabilitiesOnBasisOfMeasurementCategoryFirstApplicationOfIFRS9
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of non-current financial liabilities. [Refer: Financial liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 25
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_25&doctype=Standard
-URIDate 2019-03-27

+ Details

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

- Definition

A component of equity representing the entity's cumulative undistributed earnings or deficit.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 78
-Subparagraph e
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_e&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph IG6
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_IG6&doctype=Implementation%20Guidance
-URIDate 2019-03-27

+ Details

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

- Details

Name:	ifrs-full_RetrospectiveApplicationAndRetrospectiveRestatementAxis=ifrs-full_IncreaseDecreaseDueToChangesInAccountingPolicyRequiredByIFRSsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialLiabilitiesAxis=grfs_SeniorUnsecuredNotesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_ClassesOfFinancialLiabilitiesAxis=grfs_SeniorSecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Basis of Presentation - IFRS 9 Financial Instruments (Details) - EUR (€) € in Thousands	Dec. 31, 2019	Dec. 31, 2018	Jan. 01, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Impact on reserves due to application of IFRS 9:
Historical credit loss (as a percent)				0.19%	0.17%	0.13%
Total Debt	€ 6,846,068	€ 6,099,463
Impact on Total Debt			€ (2,580)
Impact on Deferred Expenses			(22,056)
Impact of new IFRS
Impact on reserves due to application of IFRS 9:
(Positive) Negative Impact on Reserves		€ 24,636	(24,636)
Senior Unsecured Notes
Impact on reserves due to application of IFRS 9:
Impact on Total Debt			146,333
Impact on Deferred Expenses			(41,035)
Senior Unsecured Notes \| Impact of new IFRS
Impact on reserves due to application of IFRS 9:
(Positive) Negative Impact on Reserves			105,298
Senior Secured Debt
Impact on reserves due to application of IFRS 9:
Impact on Total Debt			(148,913)
Impact on Deferred Expenses			18,979
Senior Secured Debt \| Impact of new IFRS
Impact on reserves due to application of IFRS 9:
(Positive) Negative Impact on Reserves			(129,934)
Amortised cost
Impact on reserves due to application of IFRS 9:
Total Debt			4,228,824
Amortised cost \| Senior Unsecured Notes
Impact on reserves due to application of IFRS 9:
Total Debt			853,667
Amortised cost \| Senior Secured Debt
Impact on reserves due to application of IFRS 9:
Total Debt			3,375,157
IFRS 9
Impact on reserves due to application of IFRS 9:
Total Debt			4,226,244
IFRS 9 \| Senior Unsecured Notes
Impact on reserves due to application of IFRS 9:
Total Debt			1,000,000
IFRS 9 \| Senior Secured Debt
Impact on reserves due to application of IFRS 9:
Total Debt			€ 3,226,244