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Lease - Summary of Amounts Relating to Leases in Consolidated Statements of Financial Position (Details) - KRW (₩) ₩ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Lease [Line Items]
Right-of-use assets	₩ 5,737	₩ 4,946	₩ 4,453
Lease liabilities
Current	2,653	1,986
Non-current	3,247	3,008
Total	5,900	4,994
Offices
Lease [Line Items]
Right-of-use assets	3,904	3,642	2,752
Vehicles
Lease [Line Items]
Right-of-use assets	102	266	53
Others
Lease [Line Items]
Right-of-use assets	₩ 1,731	₩ 1,038	₩ 1,648

X

- Definition

Lease.

+ References

No definition available.

+ Details

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Namespace Prefix:	grvy_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of current lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2020-01-01

+ Details

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Balance Type:	credit
Period Type:	instant

X

- 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 2020-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2020-01-01

+ Details

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Period Type:	instant

X

- References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

The amount of non-current lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 47
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2020-01-01

+ Details

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Period Type:	instant

X

- Definition

The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2020-01-01
-Paragraph 53
-Subparagraph j
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard
-URIDate 2020-01-01

+ Details

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X

- Details

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- Details

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X

- Details

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