Trade Accounts Receivable Purchase Programs (Detail) - USD ($) $ in Millions	3 Months Ended
Sep. 29, 2018	Sep. 30, 2017	Jun. 30, 2018
Receivables [Abstract]
Account Purchase Agreement Maximum Aggregate Amount	$ 25.0
Trade Accounts Receivable Sold To Third Party	22.2	$ 28.0
Accounts Receivable Factored To Banking Institutions	$ 2.0		$ 2.0

This amount represents the amount of accounts receivable sold to third party financial institutions in relation to the company's accounts receivable factoring program.

No definition available.

Name:	ktcc_AccountsReceivableFactoredToBankingInstitutions
Namespace Prefix:	ktcc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant