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Enterprise Wide Disclosures (Narrative) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Mar. 31, 2018 | Dec. 30, 2017 | Sep. 30, 2017 | Jul. 01, 2017 | Apr. 01, 2017 | Dec. 31, 2016 | Oct. 01, 2016 | Jun. 30, 2018 | Jul. 01, 2017 | Jul. 02, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 117,028 | $ 108,352 | $ 111,725 | $ 109,217 | $ 118,544 | $ 113,601 | $ 118,517 | $ 117,135 | $ 446,322 | $ 467,797 | $ 484,965
Percentage Of Net Sales |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 0.00%
Key Tronic E M S |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 445,800 | $ 466,600 | $ 483,300
Keyboard |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | $ 500 | $ 1,200 | $ 1,700

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