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Retained Earnings - Summary of Retained Earnings (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2016
Miscellaneous equity [abstract]
Minimum percentage of cash dividend declared appropriation to legal reserve	10.00%
Percentage of legal reserve equal to capital stock issued	50.00%

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- References

No definition available.

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Namespace Prefix:	ifrs-full_
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- Definition

Minimum percentage of cash dividend declared appropriation to legal reserve.

+ References

No definition available.

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Name:	kt_MinimumPercentageOfCashDividendDeclaredAppropriationToLegalReserve
Namespace Prefix:	kt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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- Definition

Percentage of legal reserves equal to capital stock.

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No definition available.

+ Details

Name:	kt_PercentageOfLegalReservesEqualToCapitalStock
Namespace Prefix:	kt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration