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Income Taxes - Additional Information (Detail) - USD ($)			3 Months Ended			6 Months Ended		12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Jul. 28, 2018	Jan. 31, 2018	Jul. 29, 2017	Jul. 28, 2018	Jul. 29, 2017	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense			$ 459,000		$ 231,000	$ 639,000	$ 378,000
Income tax benefit from windfall of stock			82,000		$ 12,000	112,000	27,000
Prior period tax benefits recognized						78,000	$ 71,000
Cumulative unrecognized tax benefits			$ 626,000	$ 665,000		626,000		$ 665,000
Developments affecting unrecognized tax benefits						$ 0
United States federal statutory income tax rate	21.00%	35.00%
One-time non-cash charge related to re-measurement of deferred tax assets				$ 1,000,000
Provisional expense recorded for Transition Tax								$ 100,000
Percentage of deduction on income tax liability						50.00%
Percentage of effect on taxable income due to Tax Act						80.00%

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Tax benefits increases resulting from windfall.

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Amount of reasonable estimate for income tax expense from transition tax on accumulated earnings of controlled foreign corporation deemed repatriated pursuant to Tax Cuts and Jobs Act of 2017 for which accounting for tax effect is incomplete.

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

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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