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Goodwill and intangibles - Narrative (Details) - North America - USD ($)
$ in Millions
6 Months Ended
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