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Summary of significant accounting policies (Tables)
 9 Months Ended
Oct. 28, 2017
Summary of significant accounting policies  
Schedule of weighted average assumptions to estimate grant date fair value of stock options

 

 

 

 

 

 

 

    

39 Weeks Ended

 

 

 

October 28,

 

October 29,

 

 

    

2017

    

2016

 

Volatility rate

 
30.9%

 
35.0%

 

Average risk-free interest rate

 
1.6%

 
1.2%

 

Average expected life (in years)

 
3.5

 
3.5

 

Dividend yield

 

None

 

None