Quarterly report pursuant to Section 13 or 15(d)

Summary of significant accounting policies (Tables)

Summary of significant accounting policies (Tables)
9 Months Ended
Oct. 31, 2015
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:


     39 Weeks Ended
     October 31, 2015   November 1, 2014

Volatility rate

   38.6%   40.8%

Average risk-free interest rate

     1.6%     1.4%

Average expected life (in years)

     5.0        3.8   

Dividend yield

   None   None