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Income Taxes - Additional Information (Detail) - USD ($)			12 Months Ended
	Jan. 01, 2018	Dec. 31, 2017	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
United States federal statutory income tax rate	21.00%	35.00%
Effective tax rate for income from continuing operation			28.40%	21.60%	36.30%
Valuation allowance			$ 1,752,000	$ 1,304,000
Increase (decrease) in valuation allowance			500,000
Recognized (benefit) expense related to interest and penalties			114,000	8,000	$ 24,000
Accrued potential interest and penalties			300,000	500,000
Deemed repatriated earnings			4,900,000
Recognized tax benefits excluding interest and penalties			362,000	$ 618,000	$ 665,000	$ 708,000
Federal Tax [Member]
Recognized (benefit) expense related to interest and penalties			74,000
Recognized tax benefits excluding interest and penalties			$ 232,000

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- Definition

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 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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