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Trade Accounts Receivable Purchase Programs (Detail) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Sep. 28, 2019 | Sep. 26, 2020 | Jun. 27, 2020
Receivables [Abstract] |  |  |
Account Purchase Agreement Maximum Aggregate Amount |  | $ 25,000,000.0 |
Trade Accounts Receivable Sold To Third Party | $ 17,800,000 |  |
Accounts Receivable Factored To Banking Institutions |  |  | $ 9,000

X
- Definition This amount represents the maximum amount of receivables eligible to be sold under the Account Purchase Agreement. + References No definition available. + Details
Name: | ktcc_AccountPurchaseAgreementMaximumAggregateAmount
Namespace Prefix: | ktcc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This amount represents the amount of accounts receivable sold to third party financial institutions in relation to the company's accounts receivable factoring program. + References No definition available. + Details
Name: | ktcc_AccountsReceivableFactoredToBankingInstitutions
Namespace Prefix: | ktcc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Trade Accounts Receivable Sold To Third Party + References No definition available. + Details
Name: | ktcc_TradeAccountsReceivableSoldToThirdParty
Namespace Prefix: | ktcc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration