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Share-based compensation - Narrative (Details)
$ in Millions
12 Months Ended
Jan. 30, 2021
USD ($)
share_option_savings_plan
shares
Feb. 01, 2020
Feb. 02, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common Shares with no vesting requirements awarded to senior management | $ $ 1.3    
Number of share option savings plans | share_option_savings_plan 3    
Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Performance period 2 years 3 years 3 years
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    
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 | Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Vesting period 3 years    
Stock Options | Omnibus Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award requisite service 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