Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Aug. 03, 2019	Jul. 28, 2018	Aug. 03, 2019	Jul. 28, 2018	Jan. 31, 2019
Income Tax Disclosure [Abstract]
Income tax expense	$ 29,000	$ 459,000	$ 429,000	$ 639,000
Income tax benefit from windfall of stock	135,000		232,000	78,000
Expiration of the statue of limitations on previously uncertain tax positions		$ 82,000	53,000	$ 112,000
Cumulative unrecognized tax benefits	592,000		$ 592,000		$ 618,000
Changes to unrecognized tax benefits	$ 0