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Income taxes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
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May 03, 2025 | May 04, 2024
Effective Income Tax Rate Reconciliation [Line Items] |  |
Excess tax benefit from share based compensation | $ 0.8 | $ (4.7)
BERMUDA |  |
Effective Income Tax Rate Reconciliation [Line Items] |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 15.00% |

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