Quarterly report pursuant to Section 13 or 15(d)

Summary of significant accounting policies (Tables)

Summary of significant accounting policies (Tables)
3 Months Ended
Apr. 30, 2016
Accounting Policies [Abstract]  
Black-Scholes Valuation Model Weighted-Average Assumptions

The Company estimated the grant date fair value of stock options using a Black-Scholes valuation model using the following weighted-average assumptions for the periods indicated:


     13 Weeks Ended
     April 30, 2016   May 2, 2015

Volatility rate

   35.0%   38.0%

Average risk-free interest rate

     1.2%     1.1%

Average expected life (in years)

     3.5        3.6   

Dividend yield

   None   None