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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jul. 29, 2017
Jul. 30, 2016
Jul. 29, 2017
Jul. 30, 2016
Jan. 28, 2017
Income Taxes          
Income tax (benefit) provision $ 2,002 $ 926 $ 1,554 $ 2,424  
Effective tax rate (as a percent)     76.40% 37.90% (69.80%)
Total amount of interest and penalties recognized 44 $ 0      
Total amount of accrued interest and penalties $ 247   $ 247   $ 167
Federal tax          
Income Taxes          
Period of statute of limitations     3 years    
State tax          
Income Taxes          
Period of statute of limitations     4 years