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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