Equity-based compensation - Valuation allowance of performance-based restricted stock units (Details) |
12 Months Ended | ||
|---|---|---|---|
|
Jan. 31, 2023
$ / shares
|
Jan. 31, 2022
$ / shares
|
Jan. 31, 2021
$ / shares
|
|
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Weighted average fair market value of grants (in USD per share) | $ 26.79 | $ 46.60 | $ 32.78 |
| PSUs | |||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Correlation coefficient | 0.4957 | 0.3878 | 0.4230 |
| Valuation date stock price (in USD per share) | $ 35.41 | $ 36.03 | $ 62.96 |
| Simulation term (in years) | 3 years | 2 years 11 months 26 days | 3 years |
| Volatility (as a percent) | 64.98% | 44.32% | 43.71% |
| Risk-free rate (as a percent) | 3.84% | 1.23% | 0.20% |
| Dividend yield (as a percent) | 0.00% | 0.00% | 0.00% |
| Weighted average fair market value of grants (in USD per share) | $ 56.52 | $ 48.47 | $ 84.38 |