Related Party Balances and Transactions (Detail) $ in Thousands	12 Months Ended
	Jan. 28, 2018 USD ($) store	Jan. 29, 2017 USD ($)	Jan. 31, 2016 USD ($)
Payments To Related Parties [Abstract]
Number of corporate-owned stores | store	1
Lease costs for one company-operated store
Payments To Related Parties [Abstract]
Related party transaction costs	$ 138	$ 108	$ 112
Consulting fees
Payments To Related Parties [Abstract]
Related party transaction costs	0	167	354
Employment compensation
Payments To Related Parties [Abstract]
Related party transaction costs	$ 270	$ 274	$ 140