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Income Taxes - Additional Information (Detail) - USD ($)			12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Income Tax Disclosure [Abstract]
United States federal statutory income tax rate	21.00%	35.00%	21.00%	32.90%	34.00%
One-time non-cash charge related to re-measurement of deferred tax assets			$ 1,000,000	$ 100,000
Provisional expense recorded for Transition Tax			$ 100,000
Effective tax rate for income from continuing operation			21.60%	36.30%	36.00%
Valuation allowance			$ 1,304,000	$ 1,161,000
Increase (decrease) in valuation allowance			100,000	500,000
Recognized (benefit) expense related to interest and penalties			8,000	24,000	$ 52,000
Accrued potential interest and penalties			500,000	$ 400,000
Deemed repatriated earnings			$ 6,600,000

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- Definition

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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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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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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

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Amount of foreign earnings repatriated from subsidiaries outside the country of domicile.

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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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Amount of expense 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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Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

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