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Share-based compensation - Narrative (Details)
$ in Millions
12 Months Ended
Jan. 28, 2023
share_option_savings_plan
shares
Jan. 29, 2022
shares
Jan. 30, 2021
USD ($)
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares with no vesting requirements awarded to senior management | $     $ 1.3
Shares granted (in shares) 0 0 0
Number of share option savings plans | share_option_savings_plan 3    
Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares available for grant (in shares) 6,075,000    
Employee Share Savings Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Discount from market price 5.00%    
Number of allocated shares (in shares) 1,250,000    
Number of allocated shares issued (in shares) 0 0 0
Sharesave Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 36 months    
Discount from market price 15.00%    
Number of allocated shares (in shares) 1,000,000    
Minimum | Sharesave Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 36 months    
Maximum | Sharesave Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 42 months    
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares) 0 0 0
Restricted Stock | Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Performance Shares      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 2 years    
Stock Options | Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expiration period 10 years    
Time-Based Restricted Stock Units | Minimum | Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 1 year    
Time-Based Restricted Stock Units | Maximum | Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years