The gross carrying amount of trade receivables from sale of goods and services.

No definition available.

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

- Definition

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2019-03-27

+ Details

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

- Definition

The amount of current trade receivables. [Refer: Trade receivables]

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 78
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78_b&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 68
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_68&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_CurrentTradeReceivables
Namespace Prefix:	ifrs-full_
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_DisclosureOfCreditRiskExposureLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The rate of expected credit losses, calculated as percentage of the gross carrying amount. Expected credit losses are the weighted average of credit losses with the respective risks of a default occurring as the weights.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph IG20D
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_IG20D&doctype=Implementation%20Guidance
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 35N
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_35N&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_ExpectedCreditLossRate
Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_CurrentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_NotLaterThanOneMonthMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanOneMonthAndNotLaterThanTwoMonthsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanTwoMonthsAndNotLaterThanThreeMonthsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanThreeMonthsAndNotLaterThanSixMonthsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanSixMonthsAndNotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_PastDueStatusAxis=ifrs-full_LaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_PastDueStatusAxis=grfs_CustomersWithObjectiveEvidenceOfImpairmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financial Instruments - Credit Risk - Trade receivables net of the bad debt provision by ageing (Details) - EUR (€) € in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Credit risk
Total gross carrying amount	€ 392,088	€ 289,698
Allowance account for credit losses of financial assets	(22,291)	(20,531)	€ (19,706)	€ (17,987)
Trade receivables	€ 369,797	€ 269,167
Not matured
Credit risk
ECL Rate	0.19%	0.19%
Total gross carrying amount	€ 285,942	€ 180,448
Allowance account for credit losses of financial assets	(585)	(335)
Trade receivables	€ 285,357	€ 180,113
Less than 1 month
Credit risk
ECL Rate	0.19%	0.19%
Total gross carrying amount	€ 48,212	€ 52,310
Allowance account for credit losses of financial assets	(57)	(92)
Trade receivables	€ 48,155	€ 52,218
Past due 31-60 days
Credit risk
ECL Rate	0.62%	0.62%
Total gross carrying amount	€ 15,831	€ 11,125
Allowance account for credit losses of financial assets	(101)	(67)
Trade receivables	€ 15,730	€ 11,058
Past due 61-90 days
Credit risk
ECL Rate	2.03%	2.03%
Total gross carrying amount	€ 10,364	€ 10,729
Allowance account for credit losses of financial assets	(156)	(208)
Trade receivables	€ 10,208	€ 10,521
Past due 91-180 days
Credit risk
ECL Rate	3.01%	3.01%
Total gross carrying amount	€ 8,606	€ 12,158
Allowance account for credit losses of financial assets	(243)	(353)
Trade receivables	€ 8,363	€ 11,805
6 - 12 months
Credit risk
ECL Rate	8.52%	8.52%
Total gross carrying amount	€ 2,216	€ 4,158
Allowance account for credit losses of financial assets	(232)	(1,222)
Trade receivables	€ 1,984	€ 2,936
More than one year
Credit risk
ECL Rate	100.00%	100.00%
Total gross carrying amount	€ 3,056	€ 7,549
Allowance account for credit losses of financial assets	(3,056)	(7,033)
Trade receivables		516
Customers with Objective Evidence of Impairment [Member]
Credit risk
Total gross carrying amount	17,861	11,221
Allowance account for credit losses of financial assets	€ (17,861)	€ (11,221)