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Goodwill and intangibles - Narrative (Details) - North America - USD ($) $ in Millions |  | 6 Months Ended
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Aug. 19, 2022 | Jul. 29, 2023
Finite-Lived Intangible Assets [Line Items] |  |
Acquisitions |  | $ 2.4
Blue Nile |  |
Finite-Lived Intangible Assets [Line Items] |  |
Intangible assets | $ 96.0 |
Acquisitions | $ 256.8 |

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