Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation (Details)

v3.19.2
Stock-based compensation (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 6 Months Ended
Aug. 03, 2019
Aug. 04, 2018
Aug. 03, 2019
Aug. 04, 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 $ 2,199 $ 2,215 $ 4,319 $ 4,423
Weighted-average grant date fair value of options granted (in dollars per share)     $ 89.91 $ 50.10
Unrecognized compensation expense 20,473   $ 20,473  
Restricted stock units        
Weighted-average assumptions to estimate fair value        
Compensation expense 3,422 3,290 6,243 $ 5,795
Unrecognized compensation expense 27,170   $ 27,170  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     47 92
Performance-based restricted stock units        
Weighted-average assumptions to estimate fair value        
Compensation expense 1,390 $ 1,722 $ 3,101 $ 3,179
Unrecognized compensation expense $ 12,745   $ 12,745  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period     21 33