Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jul. 29, 2017	Jul. 30, 2016	Jul. 29, 2017	Jul. 30, 2016	Jan. 28, 2017
Income Tax Disclosure [Abstract]
Income tax expense (benefit)	$ 5,583,000	$ 4,188,000	$ 3,670,000	$ (4,345,000)
Effective income tax rate	(245.00%)	37.70%	(48.50%)	39.90%
Unrecognized tax benefits	$ 1,400,000		$ 1,400,000		$ 1,400,000
Exposures related to unrecognized tax benefits	$ 0		$ 0
Period of unrecognized tax benefits change			12 months