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Critical Accounting Estimates and Assumptions - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018
Bottom of range [member]
Disclosure of changes in accounting estimates [line items]
Amortization term of contract assets and contract liabilities	20 months
Top of range [member]
Disclosure of changes in accounting estimates [line items]
Amortization term of contract assets and contract liabilities	34 months

X

- 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

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X

- Definition

Amortization term of contract assets and contract liabilities.

+ References

No definition available.

+ Details

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Namespace Prefix:	kt_
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Balance Type:	na
Period Type:	duration

X

- Details

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Balance Type:
Period Type:

X

- Details

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Period Type: