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Trade Accounts Receivable Purchase Programs (Detail) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jul. 01, 2017 | Jul. 16, 2015
Receivables [Abstract] |  |  |
Account Purchase Agreement Maximum Aggregate Amount |  |  | $ 25.0
Trade Accounts Receivable Sold To Third Party | $ 104.7 | $ 86.5 |
Accounts Receivable Factored To Banking Institutions and not yet collected | $ 2.0 | $ 1.6 |

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