XML 105 R93.htm IDEA: XBRL DOCUMENT
v3.19.1

Significant Accounting Policies - Summary of Estimated Useful Lives of Property, Plant and Equipment (Detail) | 12 Months Ended
--- | ---
Dec. 31, 2018
Buildings [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated Useful Life | 5 - 40 years
Structures [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated Useful Life | 5 - 40 years
Machinery and equipment (Telecommunications equipment and others) [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated Useful Life | 2 - 40 years
Vehicles [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated Useful Life | 4 - 6 years
Tools [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated Useful Life | 4 - 6 years
Office equipment [member] |
Disclosure of detailed information about property, plant and equipment [line items] |
Estimated Useful Life | 2 - 6 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_DisclosureOfPropertyPlantAndEquipmentLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The useful lives or depreciation rates used for property, plant and equipment. [Refer: Property, plant and equipment] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 16 -IssueDate 2018-01-01 -Paragraph 73 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=16&date=2018-03-01&anchor=para_73_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_UsefulLivesOrDepreciationRatesPropertyPlantAndEquipment
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_BuildingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=kt_StructuresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=kt_MachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=kt_ToolsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OfficeEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |