XML 102 R87.htm IDEA: XBRL DOCUMENT v3.8.0.1

Significant Accounting Policies - Summary of Amortization of Intangible Assets With Limited Useful Life (Detail)	12 Months Ended
	Dec. 31, 2017
Development costs [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	5 - 6 years
Software [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	6 years
Frequency usage rights [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	5 - 10 years
Others [member]
Disclosure of detailed information about intangible assets [line items]
Estimated Useful Life	2 - 50 years

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

Name:	ifrs-full_DisclosureOfIntangibleAssetsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The useful lives or amortisation rates used for intangible assets other than goodwill. [Refer: Intangible assets other than goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2017-01-01
-Paragraph 118
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2017-03-01&anchor=para_118_a&doctype=Standard
-URIDate 2017-03-09

+ Details

Name:	ifrs-full_UsefulLivesOrAmortisationRatesIntangibleAssetsOtherThanGoodwill
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_IntangibleAssetsUnderDevelopmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=kt_FrequencyUsageRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_OtherIntangibleAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: