Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation (Details)

v3.19.1
Stock-based compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
May 04, 2019
May 05, 2018
Stock options    
Weighted-average assumptions to estimate fair value    
Volatility rate (as a percent) 31.00% 29.00%
Average risk-free interest rate (as a percent) 2.30% 2.40%
Average expected life 3 years 6 months 3 years 4 months 24 days
Dividend yield (as a percent) 0.00% 0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures 97 163
Compensation expense $ 2,120 $ 2,208
Weighted-average grant date fair value of options granted (in dollars per share) $ 89.91 $ 50.10
Unrecognized compensation expense $ 22,944  
Restricted stock units    
Weighted-average assumptions to estimate fair value    
Compensation expense 2,821 $ 2,505
Unrecognized compensation expense $ 28,810  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 39 83
Performance-based restricted stock units    
Weighted-average assumptions to estimate fair value    
Compensation expense $ 1,711 $ 1,457
Unrecognized compensation expense $ 15,198  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 21 33