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

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- 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

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- 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