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Defined Contribution Plan - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
May 01, 2015
Jan. 28, 2017
Jan. 30, 2016
Jan. 31, 2015
Defined Contribution Plan Disclosure [Line Items]        
Employee annual contribution percentage, minimum 1.00%      
Employee annual contribution percentage, maximum 100.00%      
Matching contribution percentage by employer 50.00%      
Defined contribution plans annual expense incurred   $ 405 $ 426 $ 344
Maximum [Member]        
Defined Contribution Plan Disclosure [Line Items]        
Percentage of maximum eligible compensation for matching employer contribution 3.00%