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Income Taxes - Additional Information (Detail) - USD ($)			3 Months Ended			12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Apr. 28, 2018	Jan. 31, 2018	Apr. 29, 2017	Jan. 31, 2018
Income Tax Disclosure [Abstract]
Income tax expense			$ 181,000		$ 147,000
Prior period tax benefits recognized upon completion of R&D study			78,000		71,000
Income tax benefit from windfall of stock			30,000		$ 14,000
Cumulative unrecognized tax benefits			626,000	$ 665,000		$ 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 income tax expense (benefit) for remeasurement of deferred tax from change in tax rate pursuant to Tax Cuts and Jobs Act of 2017.

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Percentage of domestic federal statutory tax rate used to calculate effect of the Tax Cuts and Jobs Act of 2017 in the period of enactment.

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Tax cuts and jobs Act of 2017 incomplete accounting tax rate effect on income tax liability percent.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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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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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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