Enterprise Wide Disclosures (Narrative) (Detail) - USD ($)	3 Months Ended								12 Months Ended
	Jul. 03, 2021	Apr. 03, 2021	Dec. 26, 2020	Sep. 26, 2020	Jun. 27, 2020	Mar. 28, 2020	Dec. 28, 2019	Sep. 28, 2019	Jul. 03, 2021	Jun. 27, 2020	Jun. 29, 2019
Segment Reporting Information [Line Items]
Net sales	$ 132,629,000	$ 134,600,000	$ 128,262,000	$ 123,207,000	$ 116,018,000	$ 111,455,000	$ 116,722,000	$ 105,285,000	$ 518,698,000	$ 449,480,000	$ 464,044,000
Percentage Of Net Sales									100.00%	100.00%	100.00%
Key Tronic E M S
Segment Reporting Information [Line Items]
Net sales									$ 518,700,000	$ 449,500,000	$ 463,900,000
Keyboard
Segment Reporting Information [Line Items]
Net sales									$ 550	$ 4,000	$ 100,000