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Shareholders' Equity - Additional information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
May 01, 2017
Jan. 31, 2019
Jan. 31, 2018
Jan. 31, 2017
Class of Stock [Line Items]        
Company shares given to employees, shares   33,430 26,561 51,531
Company shares given to employees, value   $ 600 $ 400 $ 800
Common stock, authorized to be repurchased, value     $ 11,238  
Common stock shares additional authorized   390,000    
Stock Repurchase Agreement [Member]        
Class of Stock [Line Items]        
Common stock, number of shares repurchased, shares 826,305      
Common stock repurchased, per share amount $ 13.60      
Common stock, authorized to be repurchased, value $ 11,200      
Common stock owned by trust, shares 36,000