REVENUE - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Jun. 27, 2026	Jun. 28, 2025
Disaggregation of Revenue [Line Items]
Collected or invoiced amount	$ 0.8
Balance Sheet Location [Axis]: ktcc:AssetsNoncurrentExcludePPEROUAssets
Disaggregation of Revenue [Line Items]
Long term contract assets	$ 4.7	$ 10.4
Minimum
Disaggregation of Revenue [Line Items]
Typical payment terms	30 days
Maximum
Disaggregation of Revenue [Line Items]
Typical payment terms	45 days