Trade Accounts Receivable Purchase Programs (Detail) - USD ($) $ in Millions	9 Months Ended
Mar. 31, 2018	Apr. 01, 2017	Jul. 01, 2017
Receivables [Abstract]
Account Purchase Agreement Maximum Aggregate Amount	$ 20.0
Trade Accounts Receivable Sold To Third Party	81.2	$ 59.7
Accounts Receivable Factored To Banking Institutions	$ 2.4		$ 1.6

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