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Capitalization - Activity In Unvested Common Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Apr. 29, 2017
Apr. 30, 2016
Apr. 05, 2016
Stock-Based Compensation      
Closing share price (in dollars per share)     $ 16.89
Award vesting percentage 33.00%    
Number of Shares      
Unvested stock at the beginning of the period (in shares) 157,169    
Vested (in shares) (2,500)    
Forfeited (in shares) (7,500)    
Unvested stock at the end of the period (in shares) 147,169    
Weighted Average Grant-Date Fair Value      
Unvested stock at the beginning of the period (in dollars per share) $ 19.71    
Vested (in dollars per share) 22.94    
Forfeited (in dollars per share) 19.52    
Unvested stock at the end of the period (in dollars per share) $ 19.66    
Performance-Based Equity Awards      
Stock-Based Compensation      
Target growth rate (as a percent) 10.00%    
Target share price for fiscal year 2017 (in dollars per share) $ 18.58    
Target share price for fiscal year 2018 (in dollars per share) 20.44    
Target share price for fiscal year ending in 2019 (in dollars per share) $ 22.48    
Restricted Stock and Performance Stock Units      
Stock-Based Compensation      
Compensation expense (in dollars) $ 307 $ 341  
Unrecognized stock-based compensation      
Unrecognized stock-based compensation expense (in dollars) $ 1,507    
Weighted average period for recognition of unrecognized stock-based compensation expense 1 year 2 months 27 days