Quarterly report pursuant to Section 13 or 15(d)

Stock-based compensation (Details)

v3.21.2
Stock-based compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jul. 31, 2021
Aug. 01, 2020
Jul. 31, 2021
Aug. 01, 2020
Stock options        
Weighted-average assumptions to estimate fair value        
Volatility rate (as a percent)     46.90% 43.00%
Average risk-free interest rate (as a percent)     0.40% 0.30%
Average expected life     3 years 10 months 24 days 3 years 4 months 24 days
Dividend yield (as a percent)     0.00% 0.00%
Granted (in shares)     61,000 248,000
Stock-based compensation expense $ 3,101 $ 2,872 $ 5,998 $ 5,347
Weighted-average grant date fair value of options granted (in dollars per share)     $ 109.72 $ 54.40
Unrecognized compensation expense 17,216   $ 17,216  
Restricted stock units        
Weighted-average assumptions to estimate fair value        
Stock-based compensation expense 5,149 5,161 $ 9,984 $ 9,348
Granted (in shares)     58,000 158,000
Unrecognized compensation expense 32,844   $ 32,844  
Performance-based restricted stock units        
Weighted-average assumptions to estimate fair value        
Granted (in shares)     46,000 0
Stock-based compensation expense 1,869 $ 380 $ 3,115  
Stock-based compensation benefit       $ 100
Unrecognized compensation expense $ 18,130   $ 18,130