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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Jun. 27, 2019 | Jun. 28, 2018 | Jun. 29, 2017 | Jun. 30, 2016
IncomeTaxDisclosure [Line Items] |  |  |  |
Unrecognized tax benefits and accrued interest and penalties long-term | $ 259 | $ 214 |  |
Total gross amounts of unrecognized tax benefits | $ 240 | $ 207 | $ 174 | $ 24
Illinois [Member] |  |  |  |
IncomeTaxDisclosure [Line Items] |  |  |  |
Year of tax returns audit | 2016 2017 2018 |  |  |
California [Member] |  |  |  |
IncomeTaxDisclosure [Line Items] |  |  |  |
Year of tax returns audit | 2015 2016 2017 2018 |  |  |
United States [Member] |  |  |  |
IncomeTaxDisclosure [Line Items] |  |  |  |
Year of tax returns audit | 2016 2017 2018 |  |  |

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