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Income Taxes - Reconciliation of Income Tax Expense at the Statutory Federal Income Tax Rate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Income Tax Disclosure [Abstract]
Tax at federal statutory rate	$ 5,941	$ 9,134	$ 10,087
State income taxes (net of federal benefit)	598	844	1,106
Tax credits	(255)	(506)	(207)
Other	(355)	52	20
Income tax expense	$ 5,929	$ 9,524	$ 11,006

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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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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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Amount 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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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