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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands				6 Months Ended	12 Months Ended
	Jun. 29, 2018	Dec. 22, 2017	Dec. 21, 2017	Jun. 28, 2018	Jun. 28, 2018	Jun. 29, 2017	Jun. 30, 2016	Jun. 25, 2015
Income Tax Disclosure [Line Items]
Federal corporate income tax rate		21.00%	35.00%		28.10%	35.00%	35.00%
Increase in income tax expense				$ 711	$ 3,119
Impact of Tax Reform					6.30%
Total gross amounts of unrecognized tax benefits				207	$ 207	$ 174	$ 24	$ 248
Unrecognized tax benefits and accrued interest and penalties long-term				$ 214	$ 214	$ 173
Scenario Forecast [Member]
Income Tax Disclosure [Line Items]
Federal corporate income tax rate	21.00%
United States [Member]
Income Tax Disclosure [Line Items]
Year of tax returns audit					2015 2016 2017
Illinois [Member]
Income Tax Disclosure [Line Items]
Year of tax returns audit					2015 2016 2017
California [Member]
Income Tax Disclosure [Line Items]
Year of tax returns audit					2015 2016 2017

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates.

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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