Income Taxes - Additional Information (Detail) - USD ($)	12 Months Ended
	Jan. 27, 2018	Jan. 28, 2017	Jan. 30, 2016
Income Tax [Line Items]
State tax credit carryforwards		$ 190,000
Valuation allowance for deferred tax assets		56,000	$ 0
Unrecognized tax benefits		144,000	307,000
Unrecognized tax benefits reductions due to lapse of the statute of limitations		163,000	0
Accrued payment of interest and penalties associated with unrecognized tax benefits		$ 122,000	$ 247,000
Scenario, Forecast [Member]
Income Tax [Line Items]
Unrecognized tax benefits reductions due to lapse of the statute of limitations	$ 144,000
Minimum [Member]
Income Tax [Line Items]
State tax credit carryforwards, expiration year		Dec. 31, 2023
Maximum [Member]
Income Tax [Line Items]
State tax credit carryforwards, expiration year		Dec. 31, 2028