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Redeemable preferred shares - Narrative (Details) - Series A Redeemable Convertible Preferred Stock - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Oct. 05, 2016
Jul. 29, 2023
Jul. 30, 2022
Jul. 29, 2023
Jul. 30, 2022
Jan. 28, 2023
Temporary Equity [Line Items]            
Redeemable convertible preferred stock, shares issued (in shares) 625,000          
Preferred stock, purchase price $ 625.0          
Shares issued, price per share (usd per share) $ 1,000          
Preferred stock, dividend rate, percentage       5.00%    
Payments of stock issuance costs $ 13.7          
Accumulated accretion of dividends   $ 11.5 $ 9.8 $ 11.5 $ 9.8 $ 10.7
Accretion to redemption value   $ 0.4 $ 0.4 $ 0.8 $ 0.8