Trade Accounts Receivable Purchase Programs (Detail) - USD ($) $ in Millions	3 Months Ended
Sep. 30, 2017	Oct. 01, 2016	Jul. 01, 2017	Jul. 16, 2015
Receivables [Abstract]
Account Purchase Agreement Maximum Aggregate Amount				$ 20.0
Trade Accounts Receivable Sold To Third Party	$ 28.0	$ 17.4
Accounts Receivable Factored To Banking Institutions	$ 2.1		$ 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