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SEGMENT INFORMATION AND ENTERPRISE-WIDE DISCLOSURES - Schedule of Revenue from External Customers Attributed to Foreign Countries by Geographic Area (Details) | 12 Months Ended
--- | ---
Jun. 28, 2025 | Jun. 29, 2024
Segment Reporting Information [Line Items] |  |
Total | 100.00% | 100.00%
Domestic (U.S.) |  |
Segment Reporting Information [Line Items] |  |
Total | 79.00% | 77.00%
China |  |
Segment Reporting Information [Line Items] |  |
Total | 20.00% | 22.00%
Other foreign countries |  |
Segment Reporting Information [Line Items] |  |
Total | 1.00% | 1.00%

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- Definition Percentage Of Net Sales + References No definition available. + Details
Name: | ktcc_PercentageOfNetSales
Namespace Prefix: | ktcc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_CN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=us-gaap_NonUsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |