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Stock-based compensation - Stock Option Activity (Details) - Employee Stock Option [Member] - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Oct. 28, 2023 | Oct. 29, 2022 | Oct. 28, 2023 | Oct. 29, 2022
Share-based compensation |  |  |  |
Weighted-average grant date fair value (in dollars per share) |  |  | $ 199.15 | $ 149.14
Stock options |  |  |  |
Stock-based compensation expense | $ 1,742 | $ 1,646 | $ 4,961 | $ 6,152
Unrecognized stock-based compensation expense | $ 13,028 |  | $ 13,028 |
Number of options |  |  |  |
Granted (in shares) |  |  | 42 | 48

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