Enterprise Wide Disclosures (Narrative) (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jun. 29, 2019	Mar. 30, 2019	Dec. 29, 2018	Sep. 29, 2018	Jun. 27, 2020	Jun. 29, 2019	Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenues	$ 116,018,000	$ 111,455,000	$ 116,722,000	$ 105,285,000	$ 105,581,000	$ 107,954,000	$ 123,037,000	$ 127,472,000	$ 449,480,000	$ 464,044,000	$ 446,322,000
Percentage Of Net Sales									100.00%	100.00%	100.00%
Key Tronic E M S
Segment Reporting Information [Line Items]
Revenues									$ 449,500,000	$ 463,900,000	$ 445,800,000
Keyboard
Segment Reporting Information [Line Items]
Revenues									$ 4,000	$ 100,000	$ 500,000