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Other Income and Expenses - Summary of Details of Other Expense (Parenthetical) (Details) - KRW (₩) ₩ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Other Income And Expense [Abstract]
Impairment loss on other non-current assets	₩ 1,456	₩ 434

X

- Definition

Impairment loss recognised in profit or loss intangible assets and other non current assets.

+ References

No definition available.

+ Details

Name:	grvy_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsAndOtherNonCurrentAssets
Namespace Prefix:	grvy_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Other income and expense.

+ References

No definition available.

+ Details

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