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Redeemable preferred shares - Narrative (Details) - Series A Redeemable Convertible Preferred Stock - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Oct. 05, 2018
Oct. 05, 2016
Jan. 29, 2022
Jan. 30, 2021
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 (in usd per share)   $ 1,000    
Payments of stock issuance costs   $ 13.7    
Accumulated accretion of dividends     $ 9.0 $ 7.3
Preferred stock, dividend rate, percentage     5.00%  
Percentage exceeding applicable conversion price 175.00%      
Threshold period at which shares can be converted 20 days      
Percentage of cash equal to the stated value     101.00%  
Maximum        
Temporary Equity [Line Items]        
Preferred dividends, percentage of average quarterly cash dividends (not more than)     130.00%